Navier Stokes Equation for ALE Formulation
Hello, so I came across this Navier Stokes equation for ALE as stated in the Comsol module here : https://www.comsol.jp/model/fluid-structure-interaction-361 Screenshot of the equation is attached.The...
View ArticleHow can I perform an optimization study step with load ramping
Hi I am solving a non linear problems that has difficulties converging. To improve the convergence of my system I perfom load ramping as stated in this article Improving Convergence of Nonlinear...
View ArticleManipulation of data (I need to find an average dimple diameter from a data...
I need to find the average dimple diameter for a number of dimples on a stright surface, The picture attached shows the exactly what I mean.I have the x and y values i tried to manipulate it in matlab...
View ArticleIon Concentration Distribution Analysis
Are you having a good day?I have a question as I proceed with the plasma analysis.We studied with the Corona_discahge_air_1d example in the Apllaction Libraries.The purpose of our research is ion...
View Articlehow to reprocess derived values
we had calcute three derived values, now we need to reprocess these datas, like a1*V1+a2*V2+a3*V3, how to do this. thanks!
View ArticleHow to consider water self-ionization in Comsol?
Hello,I have a problem to consider the water self-ionization reaction. We know the water self-ionization H2O = H+ + OH- is an equilibrium reaction with a reaction constant Kw = [H+][OH-] = 1e-14...
View ArticleSimulating 30,300 holes
Hello COMSOL Community,I am looking for a way to simulate a MEMS mirror designed in AutoCad. The mirror is 4 mm and saturated with 5 micron holes all 15 microns apart for a total of 30,300 holes. I am...
View ArticleNeed Simulation steps of Streamer Modeling
How to model streamer propagation in transformer oil using comsol multiphysics? Can any one provide me the model or step by step modelling?
View ArticleBuilding Geometry using variable
Hai, I want to build a geometry, for example, two blocks separated by a distance d. Then I want this d to be time dependent d(t), so distance between the blocks changes when I do a time dependent...
View ArticleSelecting domains for plot using the Filter
Hello,I have 4 domains in my object and I am trying to plot domain 2 and 3. I am stuck on the syntax for the logical expression to show these two domains. I am able to use dom==2 to show just domain 2,...
View ArticleProblem in Electromagnetic Waves, Frequency Domain
Hey everyone, I am trying to simulate microwave heating using the Electromagnetic waves, frequency domain module. I have excited a rectangular port and chosen the mode TE10. The input power is 300W and...
View ArticleHelp with modeling a vertical multi-concentric tube heat exchanger
Hi all,I am new to Comsol, and I think I have pieced together a somewhat functional model. However, I have a few points that I am stuck on and looking for some general feedback on my approach.I am...
View ArticleHow to cut the boundary with the geometry imported by interpolation function
Hi, everyoneI want to import the irregular geometry model to COMSOL and I have imported the text file, the function diagram is rectangular but the text file I imported just have some coordinates of the...
View ArticleTransmembrane voltage calculation
Hi, I am pretty new to COMSOL. I am trying to calculate the transmembrane voltage of a 2D model but I am at a loss on how to go about it. I used the up(V)-down(V) expression for a 3D model (contact...
View ArticleRecoverable error in residual, but solver could not recover.
The below post is related to an archived discussion[start here]When I was coupling PDE with solid, I added the Prescribed Displacement boundary. When I had applied the reaction of the constrained...
View ArticleFace in geometry extrusion
Hello all,I am using COMSOL 5.4 I've used plane geomtry to create some meander structure and extrude that part. I've used many rectangels and combined it together to form a union.In plane geomtry, i...
View ArticleHow to add increasing surrounding hydrostatic pressure to a model (in...
Hi,I am attempting to add a surrounding pressure to my entire flap based check valve model in COMSOL. The performance of the valve at various ocen depths is being investigated, hence it is desired to...
View ArticleElectromechanical simulation for MEMS combdrive actuator (Not converge for...
Dear allHi, I am currently conducting a 2D electromechanical simulation for MEMS comb-drive actuator using COMSOL 5.4.I have attached a very rough schematic of my geometry. (sorry for the bad drawing,...
View ArticlePost processing: Applying a simple exponentially decaying weighting of...
All, I am simulating an optical biosensor probing a 2D domain at an interface. After I have a solution andmove to postprocessing I want to mimick the expeonetial decay (penetration depth ~300nm) in...
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