Best practices when running fluid-flow-dependent TDS studies
Hello,What recommendations do you give when running Transport of Diluted Species (TDS) simulations that depend on velocity fields from laminar flow studies. When using laminar flow and TDS, I never...
View ArticleMatrix has zero on diagonal...
Im trying to simulate a radiator in which water is flowing through copper tubes and the tubes are surrounded bby fins to transfer the heat. When computing I get the following error:Matrix has zero on...
View ArticleLaser cladding
I have been thinking of ways to simulate the laser cladding process. The establishment of the cladding layer is a difficulty.I don't know what method should be used to establish that the powder melts...
View ArticleHow to modify the built-in equations in Comsol Multiphysics
Hello everyone,I want to modify the built-in equations in Comsol Multiphysics, but always encounter problems. For example, I want to add a starting pressure gradient in Darcy's law in Porous Media...
View ArticleFfowcs-Williams-Hawking (FFWH) acoustic analogy
I want to ask about acoustic analogy models avaliable in COMSOL. Is FFWH acoustic analogy model is avaliable in COMSOL or not? I have search for the avalaible online materials but i have not found any...
View Articlesome question about E-Core Transformer
Hello，everyone! I have some question need your help. According to the example of case 'E-Core Transformer (Application ID: 14123)'. I have improved the coil （use the coil in Parts library），and add the...
View ArticleIssues with Modeling Rigid Probe Micromotion in Soft Tissue
Hi all,I am an undergraduate student working with COMSOL for the first time this summer. I am trying to model the effect of a rigid body moving relative to soft tissue. I designated a prescribed...
View ArticleCooling on a floor
Hi,I modeled with Comsol the decrease in the temperature of a small cube whose initial temperature is Tc placed on the ground at constant temperature Ts.Now, I would like to find my result by...
View Articlepiezoelectric prestressed frequency auxiliary sweep strange result
hello, When i do a piezoelectric prestresssed frequency simulation,the structure is a thin plate and five meshs in thickness direction, i got the "failed to find a solution maximum number of newton...
View ArticleLow frequency electromagnetic wave
Hello, I have some general questions about magnetic field distribution of rotating permanent magnet or rotating magnetic dipole in the sea (electromagnetic wave propagation in the sea): 1. Which module...
View ArticleLagrange multiplier in COMSOL 5.4
Hello,I want to use lagrange multiplier in my model , but I didn't get this variable in the transport of diluted species in COMSOL V5.4. That's why whenever I try to use this variable in later solving...
View ArticleTime dependent potential
Hai, I am fairly new to COMSOL. I have been trying to add a time dependent potential to my model. That is, I need the potential to be, say, 10V from 0 second to 5 second and then become 20V from 5s to...
View ArticleWhen is it appropriate to use the -blas option?
Dear all,I just noticed the -blas option in the reference manual. In what typical use-cases can I expect to see improvement from switching from BLAS to MKL or BLIS?Is there any rule-of-thumb or should...
View ArticleFeature: Time-Dependent Solver 1 (sol1/t1) Failed to find consistent initial...
Hello! When starting a Time Dependent study, an error occurs: Feature: Time-Dependent Solver 1 (sol1 / t1) Failed to find consistent initial values. Last time step is not converged. I can’t fix it in...
View ArticleComsol boundary stress condition in laminar flow
HiCan anyone help me to understand the boundary condition, boundry stress? I want to under stand the physical significance of normal stress, normal flow specifically in boundary stress.Thank you....
View ArticleCreate a parametric geometry starting from an imported STEP file
Hello everyone,I have a .STEP file and I want to import it in COMSOL. Is it possible to convert this CAD file in a parametric geometry in COMSOL?
View ArticleThermal contact resistance
Dear COMSOLers,For heat sink problems, how comsol treat the thermal contact resistivity at the interface between the two materials if no "Thermal Contcat" boundary condition defined? Does it just...
View Articleplot dimensionless geometry
Hi everyone!I am trying to understand how the paper (I attached the figure below) has done the plot in dimensionless (normalized r and z directions) geometry?it is a 2D axisymmetry, acoustics...
View Articlemapping volumetric heat data as boundary condition to a model
I am interested in modeling thermal stress as a result of volumetric heat (W/m^3) variation across the length of a geometry. I have the the volumetric heat vs length data but I couldn't find a way to...
View ArticlePlotting Power Graph
Hello, My goal in this project is to heat the waveguide from below using the voltage difference. I am trying to simulate a waveguide heater using Joule Heating physics. I set the voltage input to 0.1...
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