Questions tagged [comsol]
Formerly FEMLAB, COMSOL is a finite element analysis software package for various engineering and physics applications, with special emphasis on coupled phenomena (multiphysics).
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questions with no upvoted or accepted answers
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Strain propagation from surface to bulk in COMSOL
I am trying to simulate strain propagation from the surface into the bulk. I have a rectangular semiconductor block (~2 μm thick) on top of which metal gates (~25 nm thick) are deposited as seen in ...
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COMSOL - Implementing Perfectly Matched Layers (3D)
If there are any COMSOL gurus here, I want to simulate a 3D RF system infinite in 1 direction. I realize I need to use PML's, but am unsure how to configure them. it seems that simply scaling them by ...
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Fitting a multivariate PDE (using Java)
I'm doing simulations of 2 coupled PDE's with Comsol Multiphysics. I want to fit some data (using the Application method, whose language is Java) to those simulations.
In order to answer my question ...
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72 views
Derivatives over a Finite Element mesh
I have a data extracted from Comsol on some node points and I know the coordinates of each node.
Does anyone know how Comsol calculate the partial derivative from the values at each node and also ...
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203 views
Changing geometry scale breaks simulation
I'm trying to find the capacitance matrix for a small array of metal boxes in air using Comsol 5.4. The geometry presented here is a simple geometry that recreates the problem I'm experiencing.
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155 views
How to simulate water, falling under gravity, and impinging on a curved surface, which is kept/present in a domain, containing air?
TL;DR: How do I simulate a hole, at the bottom of a (full) water tank?
I am attempting to simulate water, flowing out of a hole/slit, at the bottom of a tank (Water Domain) (under the influence of ...
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851 views
3D visualization of the results of a 2D simulation in COMSOL
Considering that COMSOL forum is dead and CFD-online is not responsive, I'm gonna try asking my question here:
I have done a 2D simulation in COMSOL multiphysics. I have two independent variables x ...
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55 views
Computing dilogarithm
I'm measuring the integral of a quantity which, mathematically, requires the computation of a dilogarithm function.
$$\operatorname{Li}_2(be^{ax})$$
where $b$ and $a$ (are real and) can be positive ...
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0answers
88 views
Representing a 3D system in 2D (Electromagnetic modelling)
Ok so I'm a complete beginner in computational modelling (I use analytical methods of physics typically) but I would like to model an anisotropic, aperiodic (but not random) finite array of metallic ...
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63 views
Can I use RANS to see the effect of mixed convection?
my question is: can I use a RANS simulation to see the effect of mixed/natural convection?
Actually I have also a second question: I would like to do this in Comsol multiphysics, but it seems that it ...
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7 views
How to assign a material to each array element in COMSOL
I have an array structure $38\times38$. I want to assign a separate material to each of these. This means 1444 assignments which takes a very long time. On the other hand, it shouldn't take a very ...
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33 views
Why does COMSOL treat a well as a rectangular cube?
I'm trying to learn COMSOL for a graduate research project and am struggling through a flow and transport in 3D tutorial. As such I'm walking through my boundary conditions and trying to figure out if ...
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44 views
Show deformed mesh in Comsol
I am using COMSOL Multiphysics 5.2a in order to do thermal, mechanical and thermo-mechanical simulations. Due to a boundary load, my components get deformed which I can simulate very well. However, ...
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43 views
COMSOL Circularl polarization
I'm having some problems trying to implement circularly polarized light in COMSOL Muliphysics.
For a isotropic homogenous media, I've obtained without problems the TE and TM reflectance curves. ...
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43 views
Boundary conditions for triangular lattice in comsol
I am trying to simulate an infinite 2D triangular lattice in Comsol but I am confused that how should I use periodic floquet boundary conditions on the unit-cell.
A unit cell that I am using is given ...
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50 views
Simulating flow in a branched pipe
I am trying to simulate 1D advection and convection of a solute in the following blood vessel segment.
I would like to know if this system can be simulated in COMSOL or MATLAB.
I have used pdepe ...
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1answer
129 views
temperature profile on axial direction of a chamber
I have a task to plot average temperature profile at each cross-section in the axial direction of a combustion chamber. I have $x$, $y$, $z$ coordinates data in excel as well as the corresponding ...
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3k views
Stationary solution converge but time dependent doesn't
I've coupled a COMSOL model for fluid dynamics with a very simple pde that model the transport of humidity in air.
When I solve it for the stationary case, the solution converge easily, but when I ...
