Error in modeling a fluid flow and heat transfer in a 3D box
Hello COMSOL Users and Sir Amir Fadil and CFD Experts I am trying to simulate a 3D NITF Problem by heating up the air inside a box and observe the thermal transfer and fluid flow. The material...
View ArticleError in modeling a fluid flow and heat transfer in a 3D box
Hello Sir Amir Fadil I am trying to simulate a 3D NITF Problem by heating up the air inside a box and observe the thermal transfer and fluid flow. My intention of doing this hypothetical problem is to...
View ArticleMass in not conserved even in conservative form, multiphase flow of water...
Hello everybody, I have previously posted on a problem I was trying to simulate about multiphase flows (Multiphase Flow LS - Air Bubble in Water Cylinder - Conservative forms fails) and I have tried...
View ArticleMoving Mesh ALE - Applied to unconfined groundwater flow with unknown water...
Hi, I am trying to set up a model that was presented in the paper presented at the 2012 Conference in Milan: Simulation of Pumping Induced Groundwater Flow in Unconfined Aquifer Using Arbitrary...
View Articlephysical adsorption-which COMSOL module
Hi there, I am now working on a model about the absorption of solute by gold thin layer in a flowing cell. The absorption of solute by gold thin layer is physical adsorption. I want to know which...
View ArticleConcentrated Chemical Species
Hello All, I am in trouble defining the constraint for the dependent variables (mass fractions) in Concentrated Chemical Species physics. I have the mass fraction of Species A to E and one inert (total...
View ArticleError using analytic function of density for air
Dear Dr. Nagi Elabbasi, Greetings and May God bless you. I humbly would like to seek for your expert comment on the study that I am doing and maybe ask for some insights on where did i made mistakes in...
View ArticleTrying to set up a model for testing shock survivability
Hello all. I am designing a silicon suspended structure that will withstand more than 30,000 G shock. I am having trouble setting up the problem. I was looking for some examples that might be similar...
View Articlemodelling elatic-water interface in Solid Mechanics model
Dear all, I am trying to model a cylindrical phantom which is placed in water under acoustic radiation force. The acoustic radiation force is loaded as a 'body load' which works fine. However my...
View ArticleInlet outlet mass flux is not identical
Hi all, I am trying to measure the bulk temperature, but initial testing on the conservation of mass failed as it gave me different results between the inlet and the outlet mass flux. This result makes...
View ArticleHow to assign a 2D random function as porous matrix property (porosity)
Good morning, I really need your help, because I can't find anything in the help files. I have a model using the the Brinkman Equations module for 2 dimensional porous media flow. I want the porosity...
View ArticleCoupling 1D Pipeflow to 2D axisymmetric Porous Media
I am working on coupling 1D pipeflow to 2D axisymmetric porous media. The coupling is peformed by averaging the 2D boundary to the 1D point and integrating the 1D point to the 2D boundary. The coupling...
View ArticleMHD
Hello. Does anyone advise me where to be found magnetohydrodynamic model in comdole? Thank you.
View ArticleModeling endovascular ablation
Hi, I am trying to model endovascular ablation. I checked the video tutorial on tumor ablation, and used some tips from it, but in my case, I also have a laminar (blood) flow within the vessel. My...
View Articlelaminar flow in tube
Hi iam new to COMSOL i want to design flow in tube and valve to obstruct in the end. By changing the valve positining i want to simulate the strain distribution on the surface of cylinder(tube) can...
View ArticleMeshing of boundary layers wont work
I am trying to mesh (and, eventually, compute) a model of a rectangular duct connected to a circular hole, where the duct and the lower part of the hole are filled with water, the upper part of the...
View Article"Internal error in boundary respecting." and "Out of memory during assembly."
Dear All I have two errors in my microfluidic models about "Internal error in boundary respecting." and "Out of memory during assembly.". At first I tried to simulate the flow of the overall 3D...
View ArticleProblem with heat transfert in lava
Hello everyone, I posted a topic here because I encounter a problem with Comsol. Indeed, I try to modelize a lava flow, but I have a problem to fix the temperature of middle flow as you can see on this...
View ArticleContinuity equation and momentum equation
Hi.. i'm new in comsol.. i'm doing 2 d simualation of wind passes through the hill by comsol multiphysics 4.2. May i know, did i need to specify momentum and continuity equation (ux+vy=0 and...
View Articlehow to plot velocity profile within a pipe elbow
Hi, Can anyone please guide me as to how to do I plot the velocity profile across the geometry which consists of two pipes and a 90 degree bend in between them. I have attached my model for reference...
View Article