Autoclave with two sets of impeller blades to hollow rotating shaft - Error...
hi I developed a simple autoclave (which has two sets of impeller blades to hollow rotating shaft placed at different positions )in 3D, rotational machinery laminar flow as my physics and time...
View ArticleHow to cope with a PDE exhibiting a bifurcation
Generally my question relates to methods of coping with PDEs exhibiting bifurcations. I do it within the example of one rather simple equation. To comprehensively formulate my question I need to start...
View ArticleConfigure automation calculation task in Comsol 4.4
Dear comsol geeks there, my question is generally relative to the configuration of an automation calculation task, and the version I used is Ver 4.4, [Q1]. Can we make some automation task hook in...
View ArticleConversion method
What is the method of converting the 2D design in to 3D design in comsol
View ArticleHow to save and get the plots while solving?
In many cases for the flow problem, the solution is obtained by adopting iterative solver that means we cannot reach the solution at one time such as eigenvalue problem or frequency domain problem....
View Articleclueless error messages
Is there a list anywhere of what to look for, or what to do next (other then send the case in to support) when COMSOL returns an empty solution with the simple message "An error occured". This happens...
View ArticleUndefined value found in the equation residual vector.
I am trying to model a pem fuel cell. Although I have entered all parameters and values, i have some errors as follows; Undefined value found. - Detail: Undefined value found in the equation residual...
View ArticleI want the optimization solver to evaluate the objective at all time steps
Hello, I am using the optimization module in conjunction with the Heat Transfert in Solids and the Solid Mechanics. After computation, I always get the warning message: ' The objective is only...
View Articlecoupling of two phase free flow-Darcy flow
Hello Recently i have been trying to solve such a problem: how to couple free flow and Darcy flow for two phase fluid by Comsol in other to simulate the real situation of fluid flow freely near the...
View Articlesolving two partial differential equations nonlinear in comsol?
Hi, I want to solve two pde nonlinear with two variables (please find in the attachment file) with the constants. For solve, i tried to use the heat equation and PDE (c) in two step: step 1: solve...
View ArticleTeflon Die Extrusion
I am new to COMSOL and need some help/advise from someone with experience. This simulation is modeling a 25% glass filled-teflon billet extrusion through a steel die (1/4 of the entire model). I added...
View Articledesigning of capacitor which must be capable of lightning harvesting
I am trying to design a capacitor model under different dielectric materials and to analyze the behavior of capacitor. Can any one tell me how can i change or model capacitor with different dielectrics...
View ArticleHow does one change undesired defaults?
There are several defaults that are never my preference. Would like to change them – so sweeps go as desired when I forget to set them as desired, which usually gets over-ridden anyway with something...
View ArticleJoule heating and PDE interface - Error: Failed to find consistent initial...
Hi All. I am using v.4.1 and the Joule-heating and PDE-general form interfaces for a time-dependent study. I want to use joule-heating to solve for temperature evolution vs. time, as well as the PDE...
View ArticleError
Hi everyone!! i had following error in my model.. can any one say what it is?? Unknown function or operator. - Name: mod1.mf.mtcd1.ccc1.int_term
View ArticleExport of results in parametric sweep
Hello all! Let's say that I have a parametric sweep of a parameter A in range(1,1,15). I want to see how the sweep in A affects another parameter, let's say B. In every step I take a result for B, how...
View ArticleSimple optimization in comsol 5.0
Hey Everyone I'm trying to do A simple optimization in Comsol 5.0 However it keeps giving me an error. In the attached image you can se how I set it up. A quick summary: under definitions I have...
View Articlehigh-end computer-guidance garbage
A couple weeks ago we asked for some guidance from COMSOL on a computer upgrade - for running big problems - 10 to 20M DOFs. We were directed to this pagewww.comsol.com/support/knowledgebase/866/ where...
View ArticleModelling a Quantum Cascade Laser via Copper Heat Sink and GaAs
Apologies for the long post. The model is attached in the attachments. A simple drawing of what I am trying to model is shown in attachment (1). I am trying to simulate a type of Quantum Cascade Laser,...
View ArticleSimulating a solid cylinder with a transient displacement point source to get...
Hello, I have been trying to simulate a cylindrical model using structural mechanics(time dependent) with a transient displacement point source (0.00005*sin(2*3.14*3000*t)*e^(-((t-t0)^2)/(2*(sigma^2)))...
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