Inconsistent uni-directional constraint with Conjugate Heat transfer
I am trying to model a simple high temperature hydrogen heat exchanger with the conjugate heat transfer module. While I have been sucessfull in modeling individual tubes of the hydrogen alone, I cannot...
View ArticleAdding a Faxen Force on Stokes drag force in Particle Tracing Module
Hi everyone, I am trying to use the particle tracing module with a non-uniform laminar flow in a channel. I am using "Drag Force" to trace the particles' motion. However, the Stokes force is defined...
View ArticleFailed to find the consistent initial values
Dear sir, I am getting an error after solving as follows"Failed to find the consistent initial values Last time step is not converged. - Feature : Time - Dependent Solver1 (sol1/t1) - Error : Failed to...
View ArticleHow to reduce numerical diffusion problem when simulating micromixing
Hello Comsol friends, I have a short question - my simulations of micromixing exhibit rather fast mixin compared to the measured results, especially at high Peclet numbers (~ order of Pe~ 10 000). I've...
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hello! are you Persian? I am Persian. can you help me about problem in comsol? best regards
View ArticleHow do I model two different fluids in one domain?
Hi, I am new to COMSOL, and am trying to model a microfluidic device that has two fluids, each with a different conductivity. I tried building a geometry with two domains that are a union with an...
View Articleexporting 3D simulation's output data from model 1 and importing as input...
Hi, I am trying to simulate on micro-mixer with 3D structure. I am having trouble with importing the model 1 output data to the model 2 input profile correctly. I tried using the interpolation function...
View ArticleInductively coupled plasma-High vacuum-Laminar flow-Free Molecular Flow-times...
hello! *** first question: I try to simulate the device using the PLASMA MODULE (inductively coupled plasma) and LAMINAR FLOW in a vacuum (10 millitorr). The problem is that when I run the solver, had...
View Articleabout 'Warning : Re-ordering of null vectors failed"
Dear all, I'm trying to simulate the dynamic behaviors of the linear control solenoid valve. The spool motion is determined by the force balances, which are calculated from each field, and a...
View ArticleConsistent error while computing the results for the model built
Sir.. I am working on a building model with pipes embedded in the ceiling for Concrete Core Cooling. I am getting a continuous error even after many corrections. The error says Failed to find...
View Articlehow to enter a Channel thickness
Hi everybody, how to enter the Channel thickness? I use the (laminar flow -> mass flow -> mass flow rate -> normal mass flow rate), but get an error! I read a comsol documentation and I think...
View ArticleJoule Heating and Laminar Flow in microfluidics
I'm trying to find the temperature distribution in a microfluidic channel. The heat is generated by two electrode in a microfluidic channel. When I create the model without laminar flow everything...
View ArticleProblem with Convergence
I was running my HT+NITF model for simulation for 2 days. But, still I was not able to obtain the convergence. The progress of my simulation after 2 days of running is as follows (in the picture...
View ArticleSegregated Solver, Segregated group
What is the meaning of "Segregated Solver" and "Segregated Group"? While computing for the results, I am getting a line like follows... "Segregated Solver 17% Step 3" . And the value beside Step in...
View ArticleIll Conditioned Preconditioner
Hi everyone, I haver been trying to untangle this ill conditioned error with different meshings, which I think is the cause of the error. The temperature distribution in the soil (from 3D plot group -...
View ArticleThere's pressure gradient, but no velocity, anyone can help me out? thanks
Hi, I'm using the Free and Porous Media Flow module to simulate the fluid flow on the particle level. I used it for 2D condition and it worked. When I switched to 3D case, something weird happened. I...
View ArticleModeling Jet flow of Water in Air Atmosphere
Dear All I am modeling the flow of jet (say water or similar liquid) in an atmosphere of air. The problem is very similar to the one in the model library (the inkjet example). However, my domain...
View ArticleMovement of air due to thermal expansion
Hi everybody! I'm trying to simulate the movement of the air in 2D and I only get errors. I use two physics: laminar flow with heat transfer. I've created a square full of air and I put easy boundary...
View ArticleFailed to find the consistent initial values
Dear sir, I am getting an error after solving as follows"Failed to find the consistent initial values Last time step is not converged. - Feature : Time - Dependent Solver1 (sol1/t1) - Error : Failed to...
View ArticleHow to reduce numerical diffusion problem when simulating micromixing
Hello Comsol friends, I have a short question - my simulations of micromixing exhibit rather fast mixin compared to the measured results, especially at high Peclet numbers (~ order of Pe~ 10 000). I've...
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