Comsol symmetry For the Primary Current Distribution and Secondary Current Distribution interfaces, the Symmetry boundary condition is identical to the Insulation condition. The position of the point along the intersection line can be arbitrary as it does not change the planes definition. When applied to an edge (in the Membrane interface) the symmetry plane is formed by the normal to the boundary and the edge tangent. It has no effect on the radiosity (surface-to-surface radiation) and on the radiative intensity (radiation in participating media). You can allow a symmetry plane to move along its normal direction. So it's obviously not doing what I think it should be doing. Hello, from the archived discussion above, I understand that changing the axis of symmetry was not possible 5 years back. The following condition implements the symmetry condition on an axis or a flow divide: For axisymmetric components, COMSOL Multiphysics takes the axial symmetry boundaries (at r = 0 ) into account and automatically adds an Axial Symmetry node that is valid on the axial About symmetry- you haven't shown the rest of the geometry but as drawn the cylinder has rotational symmetry so the problem might be solved in a pie-like domain with symmetry boundary conditions on the cut surfaces. Sound Hard Boundary (Wall) condition. In case the model is 2D axisymmetric, X ref is the intersection of the symmetry plane with the axisymmetry axis (that is, X ref is located at R = 0). Learning Center: "Using Symmetry to Reduce Model Size" Documentation: Wave Optics Module > User's Guide > "Wave Optics Interfaces" > "The Electromagnetic Waves, Frequency Domain Interface" "Symmetry Plane" chapter The Symmetry node adds an edge (3D), boundary (2D), or point (2D and 3D) condition that defines asymmetry edge, boundary, or point. But how to use the quarter of the ring? Is it by drawing a quarter of a ring and then import to comsol or I can apply a quarter symmetry on the full model? Thanks. 0 Solid Mechanics module for symmetry. Let's assume your model is a periodic structure which has an E-field running along the extruded line (y), and is incident in -z (into the page). , Sector Symmetry), which enable you to specify the symmetry planes or lines of symmetry in your model. In the COMSOL Multiphysics Reference Manual: The symmetry settings are taken from the symmetry planes previously defined in the model. The Symmetry node sets the perpendicular component of the average velocity in the gap to zero. Further Learning. A demonstration is also given of how to chain together data sets to create the best custom visualization for your simulation. . It is also possible to include the dependent variable v for the out-of-plane Nonequilibrium Moisture Transport in Porous Media > Hygroscopic Porous Medium > Moist Air > Symmetry. COMSOL has blog post about this (https://www. SMHH . Hallo, i want to simulate rectangles multi-coil with symmetry. In COMSOL, you establish the geometrical symmetries by building a model with some known N-fold symmetry, and you establish the physical symmetries/anti-symmetries by selection of the proper BCs. Thank you. Here, we demonstrate how to take The Symmetry node adds a boundary condition that represents symmetry in the geometry and in the loads. For 2D axisymmetric components apply an Electrode Symmetry Axis Current Source along the symmetry axis boundary. This applies to the cases where the geometries and modeling A one-eighth symmetry model of a rectangular coil with current flowing around the winding direction. The Symmetry node describes a symmetry boundary. My question is regarding the behavior at the axis of symmetry in the axisymmetric mode. Use a Symmetry/Roller node on flat boundaries of deforming domains which are also symmetry planes in the model, or where you otherwise want to prevent boundary nodes from moving out of the plane. Note that while COMSOL employees may participate in the discussion forum, One of the ways you can simplify and reduce the size of a finite element model is by using any symmetries present in your model. When the Geometric entity level is set to Boundary , it includes no specific settings so you only need to specify the selection of boundaries where it should be valid in the Boundary Selection section. This tutorial shows how planes of symmetry can be used in a 3D model to reduce the finite element model size and make the simulation faster. Else, if the Selection method is Point selection, you can directly select the points from the Graphics window. No one will ever know you only solved on reduced dimensionality! The Symmetry node adds an edge (3D), boundary (2D), or point (2D and 3D) condition that defines asymmetry edge, boundary, or point. In reality the eigenmodes are known to be perfectly symmetric/antisymmetric. Thanks. But this is a question of convention. The Symmetry node adds a boundary condition where there is symmetry in the pressure. Usually, if you want to model "pure" heat transfer of the right "2*1/2"-model, then you would feed COMSOL with the left 1/2-model, because it HAS a geometrical symmetry boundary . Thus the model particle is specularly One of the ways you can simplify and reduce the size of a finite element model is by using any symmetries present in your model. For example I have a 3D ring and I want to use the quarter of the model to reduce the computation time. The default is Use face with lowest number . The Magnetic Insulation (magenta) and Perfect Magnetic Conductor (cyan) boundary conditions are applied along the Symmetry condition is applied to edges corresponding to the symmetry boundaries in the geometry. These include Symmetry, Symmetry Plane, and Antisymmetry boundary conditions, among other types of symmetry boundary conditions (e. In 3D components, the Planes intersection line can be set Along the x-axis, Along the y-axis, or Along the z-axis. This boundary condition is identical to that of the No Flux node. Even if you don’t have symmetry in the full problem that you want to solve, it is often advisable to work with a smaller model that does have symmetry in the initial developmental stages of your modeling. Normal Direction Condition. It is important to inspect the polarization on the plane where a symmetry plane feature is applied. But my simulation is always failed. The cell on the line of group 3 and the column of group 2 contains an X so Heat Flux is overridden by Symmetry. I would like to know if it is possible now in version 6. The condition implies symmetry in the acoustic fields For the Primary Current Distribution and Secondary Current Distribution interfaces, the Symmetry boundary condition is identical to the Insulation condition. I cannot find any boundary condition in my COMSOL's 5. COMSOL allows to specify the order in phi variation. If symmetry is prescribed for an edge which is shared between boundaries, the edge system can be ambiguous. Learn how cyclic symmetry can help reduce memory usage when modeling computationally taxing geometries by using a predefined boundary condition in COMSOL. Here, is the normal vector pointing outward from the scatterer, is the scattered intensity (Poynting) vector, and is the incident intensity. A boundary Hi A couple of comments on your model_disp: 1) understand you enforce a boundary condition bloxing X and increasing Y wih a parameter sweep 2) in the "Solve - Solver settings" or "Physics - Properties - Analysis type" your model is still "static", I would have used parametric since you select the parametric solver and want the "parameter" to be used for the The 2D axisymmetric implementation in COMSOL Multiphysics by default assumes independence of the azimuthal component of the displacement. If rays are propagating in the void region outside of the selected domains, it is possible for the rays to enter the region where r < 0, even though no geometry is defined there. Am I missing it, or the symmetry boundary condition is forced by other available conditions indirectly? Please help with this. Molecular Flow Module Updates. Generate accurate results for your piezoelectric simulations with COMSOL Multiphysics. PDT 1 Reply . This node is available only in 2D axisymmetry, where the only possible symmetry plane is normal to the Z-axis. Particular functionality may be common to several products. The force is defined as positive when acting along the outward normal of the symmetry plane. Cross-Section Definitions. The Symmetry Plane node adds a boundary condition that represents symmetry or antisymmetry in the electric field, depending on which option is chosen. That is also why Comsol operates in "densities" and then The Symmetry node can be used to represent boundaries where the species concentration is symmetric, that is, where there is no mass flux across the boundary. No Flux condition. However, when using comsol, I am finding even and odd modes which are asymmetric. The Symmetry node adds a boundary condition where there is symmetry in the pressure and displacement field. Posted Apr 14, 2010, 6:40 a. Selection. Select 1, 2, or 3 for the first, second, or third axis in the selected coordinate system. 1 Reply Last Post Jan 10, 2013, 1:01 p. For the Tertiary Current Distribution, Nernst–Planck interface, the Symmetry boundary condition imposes a no flux condition for the molar flux of species at a boundary. The symmetry condition only applies to the temperature field. The first 2 simulations are easily done using the coil geometry analysis node (and ensuing the length factor is given as 2 for the single plane symmetry version, so that the coil resistance is calculated correctly). Symmetry Type. The following condition implements the symmetry condition on an axis or a flow divide: For axisymmetric components, COMSOL Multiphysics takes the axial symmetry boundaries (at r = 0 ) into account and automatically adds an Axial Symmetry node that is valid on the axial This section is shown if Sector symmetry or Sector symmetry with reflection is selected from the Type of symmetry list in the Symmetry section. However, the longitudinal magnetic field component in the waveguide is incorrectly suppressed by the symmetry plane. You would however need to be careful to apply the voltage or current input to the symmetry model as you would have to manually consider the symmetry factor here. The Symmetry node can be used to represent boundaries where the species concentration is symmetric, that is, where there is no mass flux across the boundary. Enter a value for the Number of sectors (dimensionless). In the COMSOL Multiphysics Reference Manual: In 3D components, the symmetry axis is defined by two points. Want to learn more about symmetry boundary conditions? Contact us via the button below: The Symmetry node can be used to represent boundaries where the species concentration is symmetric, that is, where there is no mass flux across the boundary. Coordinate System Selection. For users of the Molecular Flow Module, COMSOL Multiphysics ® version 6. For half symmetry (one plane), X ref may be an arbitrary point on the symmetry plane. The default is 4. The Symmetry node applies symmetry conditions for the fluid flow and heat transfer equations, as appropriate. Now that I see the results, I realize that the symmetry condition in Structural Mechanics only forces the normal displacements to the symmetry Select Prescribed force to prescribe the total reaction force acting on the direction normal to the symmetry plane. Exploiting symmetry is a great way to reduce computational expense. The Global coordinate system is selected by default. The integral is taken over the Select Prescribed force to prescribe the total reaction force acting on the direction normal to the symmetry plane. For particle tracing models, the physical interpretation of plane symmetry is as follows: for every particle that exits the domain through a boundary assigned a Symmetry node, a new particle enters the modeling domain at the same location at the same time, with an incoming velocity that mirrors the outgoing velocity of the exiting particle. Note: This discussion is about an older version of the COMSOL Multiphysics Does it mean that you want to model the symmetric part as 1/2 and apply symmetry BC to it, but still connect it to the non symmetri part over some boundary load ? Select Prescribed force to prescribe the total reaction force acting on the direction normal to the symmetry plane. g. Symmetries can often greatly reduce the size of a model and hence reduce the memory requirements and solution time. Cheers, Hossein Select Prescribed force to prescribe the total reaction force acting on the direction normal to the symmetry plane. Use this condition to reduce the size of a model by cutting it in half where there are known symmetries. The scattering cross section is defined as:. Evan Barna . Please login with a confirmed email address before reporting spam I am running a 2d axial Note that while COMSOL employees may participate in the discussion forum, For Cylinder, select Axis type — X-axis, Y-axis, Z-axis, or User defined to describe the orientation of the cylinder. It is also possible to include the dependent variable v for the out-of-plane For 2D axial symmetry, a boundary condition does not need to be defined for the symmetry axis at r = 0. The Learn how cyclic symmetry can help reduce memory usage when modeling computationally taxing geometries by using a predefined boundary condition in COMSOL. Read more about this update below. I've scoured the COMSOL forums, and while they are normally very helpful (thank you to everyone who takes the time to respond, you aren't just helping the OP) all the advice on symmetry is very vague and esoteric to a beginner like myself. Enter the location of a Point on axis, X c, in order fix the location of the cylinder. Learn more with our piezoelectric transducer example. When a structure exhibits axial symmetry, use the axisymmetric physics interfaces. 3a 2 Replies . rotation of the object 45 deg or -45 deg will give identical structures). This is Chapter 2 of 3 in Select Prescribed force to prescribe the total reaction force acting on the direction normal to the symmetry plane. These savings can be significant when working with large models and multiphysics models. I was wondering if there was any symmetry boundary (much like the symmetric boundary condition in Lumerical's FDTD). Enter the Electrode current source q l,s (SI unit: A/m). The design and physics are symmetric along the XZ-plane, enabling us to simplify the geometry by removing half (right). Ribbon. The boundary condition for symmetry boundaries prescribes no penetration and vanishing shear stresses: Boundary Selection. I only found the possibility to declare the symmetry boundary for the heat transfer, where the symmetry plane is inside the relevant domain. EDT MEMS & Nanotechnology, Acoustics & Vibrations Version 5. Jungwirth[1] and M. Best Regards, Nirmal Use the Matrix symmetry list (see the General section on the Settings window for Advanced for a solver node such as Stationary Solver). Send Private Message Flag post as spam. To determine the right combination of products for your modeling needs, review the Specification Chart and make I have a 3D model with a symmetry plane. If all selected boundaries, to within a small tolerance, are located in the same plane, then the normal vector, n, is computed using an averaging scheme. Similarly, for Electrostatics, Zero Charge boundary condition acts as symmetry BC. Learning Center: "Using Symmetry to Reduce Model Size" Documentation: Wave Optics Module > User's Guide > "Wave Optics Interfaces" > "The Electromagnetic Waves, Frequency Domain Interface" "Symmetry Plane" chapter I having problem using symmetry to simulate my model. 1, and if so, how? Otherwise, my query is: I want to create a cylindrical domain where the axis of symmetry is along the z-axis, and not in radial direction. In the COMSOL Multiphysics Reference Manual: Learn how to create a plot using the Mirror, Extrusion, and Sector Data Sets to visualize the results from a model with symmetry. Many physics interfaces are For the Primary Current Distribution and Secondary Current Distribution interfaces, the Symmetry boundary condition is identical to the Insulation condition. Thus the model particle is specularly 2d Axial Symmetry Solution. Using symmetry requires some thought but can really pay off in reduced computation time for a complex 3D geometry. The combination of COMSOL ® products required to model your application depends on several factors and may include boundary conditions, material properties, physics interfaces, and part libraries. How can I Remember that physics and study matter when it comes to symmetry, such that acoustics is different than solid mechanics, when comparing the geometrical symmetry with the physics symmetry, and a driven response might require different thoughts about symmetry than an eigenmode analysis. Hello, I have constructed a 2D geometry (4 circles arranged in each corner of a square) with rotational symmetry for every 90 deg (i. You could want to impose some other conditio n to it, cte T or I do no what I see it as to remind you with where it is, and the flux thereon has a internal normal condition, even if not explicit, coming from the symmetry--Good luck The Symmetry node adds boundary conditions that describe symmetry boundaries in fluid-flow simulations. The plot should be constant inside and outside the wire, and the expected plot is shown in the I am attaching the COMSOL The Symmetry node adds a boundary condition where there is symmetry in the pressure. 2) Create symmetry planes to force even or odd modes. The first has no symmetry, the second has a single plane of symmetry and the third has symmetry in 2 planes. The constraints will act radially from the cylinder axis. Additional options apply to the displacement field normal component. Next Step. Learning Center: "Using Symmetry to Reduce Model Size" Documentation: Wave Optics Module > User's Guide > "Wave Optics Interfaces" > "The Electromagnetic Waves, Frequency Domain Interface" "Symmetry Plane" chapter Select Prescribed force to prescribe the total reaction force acting on the direction normal to the symmetry plane. My study steps are, coil analytic and frequency domain. The Symmetry Plane node adds a boundary condition that represents symmetry in the geometry and in the loads. When a This tutorial shows how planes of symmetry can be used in a 3D model to reduce the finite element model size and make the simulation faster. Some waveguides modes cannot be simplified using symmetry plane features. This mechanism can be checked on the COMSOL Desktop, in the Override and Contribution section of each feature, as shown in the following table: This specifies the direction of the normal to the symmetry plane. Then in principle if the structure is cylindrically symmetric, the excitation can be expanded. Specify the coordinate system to use for specifying the orientation of the symmetry plane. comsol. Jaehoon Lee Note that while COMSOL employees may participate in the discussion forum, For the Primary Current Distribution and Secondary Current Distribution interfaces, the Symmetry boundary condition is identical to the Insulation condition. In 2D, this feature assumes rotation around the origin. In a previous blog entry, we showed you how to model rotating machines, like motors and generators, using the Rotating Machinery, Magnetic interface in COMSOL Multiphysics. The Magnetic Insulation boundary condition in COMSOL Multiphysics ® imposes symmetry on the sides. m. If the geometry exhibits two symmetry planes (Figure 2-6), model a quarter of the geometry by using the Symmetry node for the two selected Even if you don’t have symmetry in the full problem that you want to solve, it is often advisable to work with a smaller model that does have symmetry in the initial developmental stages of your modeling. Two types of symmetry boundary By using symmetries in a model you can reduce its size by half or more, making this an efficient tool for solving large problems. PST. You can then solve a 2D problem in the rz-plane instead of the full 3D model, which can save considerable memory and computation time. Enter the Normal force F n. e. Table 6-41: Layer Selections; Symmetry. (2) Symmetry in the physics (to include the expected solution of the problem) If both the geometry and physics exhibit a symmetry with respect to a plane, you can generally cut the problem along that plane, and limit your geometry and model to one half of the original, since the solution in the other half follows immediately from the symmetry. A default subnode is added. The following condition implements the symmetry condition on an axis or a flow divide: For axisymmetric components, COMSOL Multiphysics takes the axial symmetry boundaries (at r = 0 ) into account and automatically adds an Axial Symmetry node that is valid on the axial symmetry boundaries only. It is also beneficial regardless of the phase See more To reduce the computational time and resources required to compute a model, there are several strategies you can employ as well as features in the COMSOL Multiphysics ® software that you can use. Or in other words, the symmetry boundary essentially copies the model accross the symmetry boundary and I can get the focusing effect of my phased array for a fourth of the computation. Today, we will demonstrate the steps we Symmetry can be exploited to reduce the model to a 45 ° section of the loop, and mirrored about its plane. Select Prescribed force to prescribe the total reaction force acting on the direction normal to the symmetry plane. Therefore, the physical components of the radial and axial displacement, u and w, are used by default as dependent variables for the axially symmetric geometry. It is only available for pairs. If the geometry exhibits two symmetry planes (Figure 2-16), model a quarter of the geometry by using the Symmetry node for the two selected surfaces. The direction of the angle θ can be Select Sector Symmetry at interfaces between rotating objects where sector symmetry is used. The symmetry plane is formed by the normal to the membrane surface and the edge tangent. To take advantage of symmetry planes and symmetry lines, all of the geometry, material properties, and boundary conditions must be symmetric, and any loads or sources must be symmetric or The Symmetry/Roller feature can be added from the model tree under Component>Definitions using the Shape Optimization context menu. Gilad, indeed axial symmetry is only suitable for very specific cases in RF-electromagnetics, e. This allows the mesh to move tangentially to the symmetry/roller plane, but not in its normal direction. In an effort to reduce memory requirements, we make use of the model’s symmetry when creating the geometry. If the geometry exhibits two symmetry planes (Figure 2-6), model a quarter of the geometry by using the Symmetry node for the two selected surfaces. Two types of sym The Symmetry node adds an edge (3D), boundary (2D), or point (2D and 3D) condition that defines a symmetry edge, boundary, or point. In pressure acoustics, this boundary condition is mathematically identical to the Sound Hard Boundary (Wall) condition. The Symmetry node adds a boundary condition that represents symmetry in the geometry and in the loads. The Shell-and-Tube Heat Exchanger tutorial model geometry (left). Axial symmetry is common for cylindrical and similar 3D geometries. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help. This should be an integer representing the number of sectors that constitute a full revolution around the symmetry axis. a dipole or a coaxial cable, not for a plane wave. A symmetry condition is free in the plane and fixed in the out-of-plane direction. This remedies problems that can occur for example when not all nodes on a symmetry plane of A symmetry condition is free in the plane and fixed in the out-of-plane direction. Then (no radiation) the results would I having problem using symmetry to simulate my model. com The Axial Symmetry condition only applies to straight boundaries that are both on the axis of symmetry and adjacent to a domain in the selection of the physics interface. The Symmetry node adds an edge (3D), boundary (2D), or point (2D and 3D) condition that defines asymmetry edge, boundary, or point. Electrode Current Source. I had to learn it too, so in the programmes I use I always need to multiply absolute quantities by the number of symmetry planes. The software automatically provides a condition that prescribes u r = 0 and vanishing stresses in the z direction and adds an Axial Symmetry node that implements these conditions on the axial symmetry boundaries only. If the geometry is axisymmetric, there are variations in the radial (r) and vertical (z) direction only and not in the angular (θ) direction. I have defined the coil by numeric multiturn coils. Physics tab with interface as Moisture Transport in Air, or any version of the Moisture Transport interface selected: Boundaries > interface > Symmetry. Rabl[1] [1]Wels School of Engineering, Upper Austria University of Applied Sciences, Wels, Austria Just a simple question: How can I mirror the results through a symmetry plane in comsol's post processing? I want to view the results in full domain instead of half of it. If Symmetry is chosen, the its the boundary by default on the axis of symmetry, indeed nothing special to sayabout it, what do you expect. This can be used to model some situations where you want a plane to remain strictly planar but still relax the property of it being fixed. It can be applied on exterior boundaries only. Whether you are building the geometry natively in COMSOL Multiphysics ® or importing a design from an external file, there are modeling strategies as well as features in the software that you can use to take advantage of such symmetries. Also, one nice feature in COMSOL is that you can re-constitute the full 3D geometries using revolved, sector, or mirror data sets under Results>Data Sets. It is also possible to include the dependent variable v for the out-of-plane For instance, a Zero tangential magnetic field (PMC) symmetry plane cut at the center of a TE20 rectangular waveguide mode can satisfy the boundary condition of the transverse electric field on a port boundary. The axial symmetry implementation in COMSOL Multiphysics by default assumes independence of the azimuthal component of the displacement. When User defined is used, enter the vector e s, pointing along the axis of the cylinder. The symmetry plane enforces a PEC or PMC condition and thereby suppresses the tangential field component of electric field or magnetic field on the plane, respectively. Reducing the size of your model is advantageous because of the amount of computational time and memory that can be saved when solving the equations for your model. I have been using the symmetry boundary condition for structural mechanics. Bartek, PMC is an appropriate boundary condition to account for symmetry plane. Use Symmetry for Surface-to-Surface Radiation to account Select Prescribed force to prescribe the total reaction force acting on the direction normal to the symmetry plane. Learning Center: "Using Symmetry to Reduce Model Size" Documentation: Wave Optics Module > User's Guide > "Wave Optics The Symmetry Plane node adds a boundary condition that represents symmetry in the geometry and in the loads. Want to learn The Symmetry node can be used to represent boundaries where the species concentration is symmetric; that is, there is no mass flux in the normal direction across the boundary: This boundary condition is identical to the No Flux node, but applies to all species and cannot be applied to individual species. Use Symmetry for Surface-to-Surface Radiation to take into account the symmetry in the computation of the view factors. Optimization of Bending-Type Ultrasonic Transducers with Rotational Symmetry Using COMSOL Multiphysics ® M. hallo, i simulate a 3D model with ironcore and coil using 1/4 symmetry. Right-click to select additional features from the Fallback Features submenu. It is also possible to include the dependent variable v for the out-of-plane The Symmetry node describes a symmetry boundary. The Symmetry node describes a symmetry boundary where there is no tangential flow. The Symmetry node can be used to represent boundaries where the species concentration is symmetric; that is, there is no mass flux in the normal direction across the boundary: This boundary condition is identical to the No Flux node, but applies to all species and cannot be applied to individual species. Does anyone know how to: 1) Create perfectly symmetric meshes. For 2D axisymmetric components, COMSOL Multiphysics takes the axial symmetry boundaries (at r = 0) into account and automatically adds an Axial Symmetry node to the component that is valid on the axial symmetry boundaries only. the geometry is symmetric across the xy origin plane. I would suspect first of all non symmetric mesh effecting the numeric results, have you tried to increase the mesh density, and to mesh one half and mirror the mesh along the symmetry boundary ? Also if you have some singularities (sharp corners, you can easily get rather large errors on force calculations if you integrate over such singularities A symmetry condition is free in the plane and fixed in the out-of-plane direction. 2D planar symmetry can be suitable for a plane wave. A Point at the intersection of symmetry planes and the Rotation angle from Cartesian axis, θ, should be defined. If the Selection method is Coordinates, set the x, y, and z coordinates of the First point defining sector symmetry axis and of the Second point defining sector symmetry axis. Border condition with zero pressure is applied to other edges as default. The selection in this section only acts as a filter for the boundary selection. 2D Axial Symmetry Simulation rotation only 90degree. 1 Reply Last Post Jan 23, 2024, The Symmetry node adds a boundary condition that represents symmetry in the geometry and in the loads. In the COMSOL Multiphysics Reference Manual: For particle tracing models, the physical interpretation of plane symmetry is as follows: for every particle that exits the domain through a boundary assigned a Symmetry node, a new particle enters the modeling domain at the same location at the same time, with an incoming velocity that mirrors the outgoing velocity of the exiting particle. Shell Properties. The Symmetry node can be used to represents a boundaries where the concentration is symmetric; that is, there is no species flux in the normal direction across the boundary. My study is frequency domain at 30kHz. Setting the prescribed force to zero gives the same effect as using Free Displacement. Posted Oct 29, 2019, 8:10 p. I would need something to mirror the pipe to the other side. The 2D axisymmetric implementation in COMSOL Multiphysics by default assumes independence of the azimuthal component of the displacement. This boundary condition is identical to that of the No Flux condition. • These include Symmetry, Symmetry Plane, and Antisymmetry boundary conditions, among other types of symmetry boundary conditions (e. There you can explicitly state whether the assembled matrices (stiffness matrix, mass matrix) resulting from The Symmetry node can be used to represent boundaries where the phase field variable distribution is symmetric, that is, where there is no flux across the boundary. Physics Interface Axial Symmetry Node in the COMSOL Multiphysics Reference Manual. I suspect that this is a result of meshing. Coordinate System Selection Specify the coordinate system to use for specifying the orientation of the symmetry plane. In this COMSOL Multiphysics example, a peristaltic pump is analyzed by combining structural mechanics (to model the squeezing of the tube) and fluid dynamics (to compute the fluid’s For the Primary Current Distribution and Secondary Current Distribution interfaces, the Symmetry boundary condition is identical to the Insulation condition. Constraint Settings To display this section, click the Show More Options button ( ) and select Advanced Physics Options . Improved Symmetry Condition for For 2D axial symmetry, a boundary condition does not need to be defined for the symmetry axis at r = 0. The condition is equivalent to specifying a zero normal mesh displacement in The Symmetry node describes a symmetry boundary. The problem is I get the same pressure field in the water whether or not I assign symmetry boundaries. In many cases symmetry of the geometry and loads can be used to your advantage in modeling. Select the boundary which should define the edge system. To get correct radiation pattern with symmetry plane, you need to impose the same symmetry boundary condition for the Far-Field Calculation: under Far-Field Domain>Far-Field Calculation node, check Symmetry in E (PMC) box and choose appropriate plane. Use this condition to reduce the size of a model by cutting it in half where there are symmetries. 1 offers a new feature for identifying planes of reflection symmetry and applying sector symmetry. The constraint is applied all through the thickness of the shell. The Symmetry boundary condition that is used in the Shell-and-Tube Heat Exchanger tutorial model. The symmetry settings are taken from the symmetry planes previously defined in the model. If the analysis is geometrically The Symmetry node adds a boundary condition imposing symmetry in the pressure and velocity field. Choose between Symmetry and Antisymmetry for the electric field. Hello COMSOL community, I am currently trying to simulate a rectangular grating that is periodic in the z direction. eskak krkrq hir nxhb wzrfr jyxjded gevgsf gutu vgzpc hbmbo

Comsol symmetry. Normal Direction Condition.