Plane wave excitation using port
Good Day All,Has anyone had experience plane wave excitation (both longitudinal and transverse) at the boundary of an infinite half space (2D or 3D) of a material? Can this be done using ports and if...
View Articleeigenfrequency computation
What algorithm is used in comsol in order to compute the eigenfrequency in micro ring resonators? We can changed the number of eigenfrequency manually and corresponding Q factor therefore I was...
View ArticleRe-entry satellite - High Mach Number
Hello,I study the aerothermal effects of a CubeSat which comes back to earth. At the end, I have to find the temperature of the satellite. First, I made lot of research, and I seen that the satellite...
View ArticleLaminar flow and Transport of diluted species
Hi all! I am new to comsol and I am simulating flow of air+acetone in and out of a chamber. For this,I am using transport of diluted species and laminar flow physics. But I get the error of...
View ArticleOne Study with stationary and time dependent steps
Hello,i want to run one study in which i have different types of steps.First a stationary to solve a flow, afterwards solving a time-dependent to solfe a heat transfer simulation for some seconds,...
View ArticleStrain plots in structural analysis
I am trying to obtain the various strain plots from a structural analysis of a thin film, fixed at the bottom and loaded from the top in compression. every time I try to plot strain I get the following...
View ArticleFactorial function
Hello everybody, How to formulate a factorial function in COMSOL to build a parametric surface? I need to formulate this function: N!(N-s)! where ''s'' is a variable. I used the formulas:...
View Article"volume force" in Laminar flow is not working
Hi, I want to calculate the drag force on a sphere moving through the fluid. I am using "laminar flow" with axisymmetry. Normally, my code is working perfectly fine and giving me the correct value of...
View ArticleVisual representation of thermal expansion not making sense
Hi all.To communicate my problem I made a simple bimetallic strip (library Materials Values for Copper and Iron) which is fixed to a surface where a temperature T is introduced - no thermal dissipation...
View ArticleRecursive updating
The below post is related to an archived discussion[start here]I have this same doubt. Please help!
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Mathematics Global ODEs and DAEs: How to port ODEs system from Mathcad?
Hi, I have the following system of ODEs in Mathcad:It does solve well in Mathcad, however when I try to port it to COMSOL - the results are flat lines (equal to initial conditions).Here is how I write...
View ArticleImplementing a force including delta function
Hi,I am working on two-phase (levelset) problem and I need to define a force and add it to NS equation (Laminar flow). The force is equal to constant * delta* n where delta and n are the delta function...
View ArticleProblem in simulating microfluidic channel
Hi, I am trying to simulate particle separation in microfluidic channel using SAW. Raising error , cannot evaluate acoustophoretic and drag force at the edges of fluidc channel in contact with...
View ArticleSimulating the magnetic field distribution around current carrying traces
Dear COMSOL community,I just started to work with the software a few months ago for my Master's thesis and the last few weeks I am stuck due to several problem. My goal is to simulate the magnetic...
View ArticleTo calculate oersted field generated from current using ampere's law.
Hello everyone! I am new to Comsol Multiphysics. I need to study the oersted field generated in a bilayer structure of Permalloy (Ni 80%, Fe 20%) and Platinum. I am using AC/DC module and using...
View ArticleLaminar flow and Heat transfer
Hello guys!I am facing a problem with Laminar flow and Heat Transfer in Fluids modules. I have found some examples regarding these modules, where in the boundary conditions of the Laminar Flow the...
View ArticleThe time dependent solver continue to simulate even after simulations are done?
I encountered this issue when i simulate for 0 to 168s, the comsol solves the model and again it continues to solve from 0s. I even tried to check for solving 0-1s the issue is similar. The model is...
View ArticleSpacing in the tridirectional coil
Will the spacing of the coil (a,b,c) matters for the path loss and induced current for the Receiver ?Regards Rajpreet
View ArticleHow to derive capacitance matrix
I have a four core cable and I want to get the capacitance matrix over frequency.I set the common screen to be ground and set the four cores to be different terminal, list them 1 to 4. and set them to...
View ArticleMonte carlo optimization
Hello. I try to find the some article which use the monte carlo method in optimization, comsol And I found 2 article as bellow 1.Patch antenna optimization in comsol multiphysics 2.Simulated annealing...
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