It requires much fewer mesh elements to resolve each propagating wave when compared to traditional methods. I am hoping that i can use a small subset of it and use the periodic boundary condition in the transient state to find the solution rather than using the complete model which would have way. I guess i really need to simulate just one of the half of the whole if i can apply symmetric condition to xy plane. The results include the magnetic and electric fields, the magnetic saturation effect, transient response, and more.
Citeseerx isotropic slab excited by a periodic light. Periodicboundaryconditionux 1,pred,f represents a periodic boundary condition for all x target on the boundary of the region given to ndsolve where pred is true. I want to simulate a 3d nanowire by periodic boundary condition in comsolelectrostatics mode for the first time. Symmetry condition is used for cases with straight grooves open in both directions gd w, with. Hi for me it should be rather rather similar, you have an example mixed physics in the smemodlib. I have some questions about periodic boundarypbc condition that is used in fem. The release also includes new hybrid boundary element method bem compatibilities. The periodic boundary condition cannot applied upon the.
The beam envelope method analyzes the slowly varying electric field envelope for optically large simulations without relying on traditional approximations. Learn how to use the periodic boundary condition to numerically simplify your rf models in comsol multiphysics includes 4 examples. Periodic boundary conditions for dislocation dynamics. Ansys fluent tutorial 7, modeling periodic flow and heat.
Can the periodic boundary condition be applied to a transient model laminar flow equation. And for the boundaries with a normal vector in xdirection floquet periodic condition are used. I attached to this post an example that uses periodic boundary condition. This periodicity can be continuous the default or antiperiodic and can control which of the dependent variables that the periodic. The software described in this document is furnished under a license agreement. The study presents first authors experience with comsol multiphysics environment. For this reason, we solved the heat conduction equation for a homogeneous and isotropic solid slab exited by a periodic light beam on its front surface, with the boundary conditions congruent with the physical situation, by means of application the comsol multiphysics software. In this model a plane wave with a wavevector with nonzero x and zcomponent and polarisation in ydirection should be modelled. Wave optics requires a numerical method that can efficiently model and solve complex problems.
The settings for the applied heat flux boundary condition. Both modules provide floquet periodic boundary conditions and periodic ports. Its a turbomachinery problem so i need periodic boundary condition but cyclic boundary condition. Comsol reports that its series of solvers has received an impressive speed boost since the 5.
The settings used to define a periodic function, as plotted. At the top and bottom boundary scattering boundary conditions are used in order to allow an excitation. Although the comsol software is flexible enough to allow any definition of. Excerpt from the proceedings of the comsol conference 2010 boston.
Dear comsol community, i am dealing with floquet type of periodic boundary conditions. This paper reports a fem simulation of two degree of freedom torsional ring gyroscope and its eigen frequency analysis using comsol multiphysics tool. An ecore transformer example model that takes into account the effect of a nonlinear bh curve in the softiron core. I feel a bit unconfortable with this trick its hard to say why. I would be very grateful if someone can help me with several issues.
Periodic boundary conditions are used to reduce simulation time. Using periodic boundary conditions use periodic boundary conditions, periodic edge conditions, and periodic point conditions to define a constraint that makes two quantities equal on two different but usually equally shaped domains. Open the comsol multiphysics folder, open the heat transfer folder, and select conduction. Pbcs are often used in computer simulations and mathematical models. Comsol multiphysics an overview sciencedirect topics. Cfd simulation of heat exchanger by solidworks programme duration. This video guides you to implement the periodic boundary condition for the. Implementation of periodic boundary condition comsol. Comsol multiphysics users guide for detailed instructions. The lowest saw eigen mode has its wavelength equal to the width of the geometry of 3 to 4. And to cap it off, the software will greatly improve the workflow for chemical engineering users. To implement a periodic boundary condition in femlab, go through the following steps. The comsol discussion forum covers a wide variety of simulation topics. Periodicboundarycondition wolfram language documentation.
The topology of twodimensional pbc is equal to that of a world map of some video games. Introduction about the cfd module 22 why cfd is important for modeling. I mean, i have a geometry which has clear symmetric with respect to xy plane. Periodic boundary condition in comsol can anyone help.
The structural mechanics module includes both predefined material models to choose from and the ability to enter userdefined material models, depending on the nature of your analysis. How to write the periodic boundary condition in matlab. My geometry is very complex so i use multiblock method. In addition to the in addition to the interfaces included with the basic comsol license, the interfaces below are included. Here, we used two rings in which outer ring is free to move in the drive direction xaxis while the inner ring is free to oscillate in sense direction yaxis. How to specify periodic boundary condition when not available in. Browse the threads and share your ideas with the comsol community. The periodic extension option is used to repeat this pattern every five seconds, as shown in the screenshot below. Help with periodic boundary conditions posted 6 set 2018, 21. Boundary conditions in the tutorial model periodic. How to numerically simplify your periodic rf models comsol blog. Boundary condition assignment for periodic structure in comsol posted 25feb2020, 1. Boundary element method for acoustics and electromagnetics. The periodic boundary condition cannot applied upon the boundary of pml in solid mechanics module.
S a particle which goes out from the simulation box by one side is reintroduced in the box by the opposite side in the 3 dimension of space. Boundary condition assignment for periodic structure in comsol. Ansys has that feature and in comsol, periodic boundary condition has the same role to this. In the attached image, a surface acosutic wave saw sensor is shown, wherein four pressure forces nm are applied on the lateral sides of the substrate. Im wondering what periodic boundary condition means. The periodic condition node adds a periodic boundary condition. Periodic boundary condition trick mathematica stack exchange. Periodic boundary conditions pbcs are a set of boundary conditions which are often chosen for approximating a large infinite system by using a small part called a unit cell.
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