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hello!

hello! are you Persian? I am Persian. can you help me about problem in comsol? best regards

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How 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...

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exporting 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...

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Inductively 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...

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about '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...

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Consistent 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...

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how 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...

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Joule 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...

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Problem 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...

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Segregated 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...

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Ill 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 -...

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There'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...

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water flow in a hydrophobic tube

Hi, I want to simulate water flow inside a tube. This tube has surface tension of 30.35mN/m which is high hydrophobicity. For now, I only able to simulate just the water flow itself. I don’t know how...

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Wall Resolution and Wall Lift-off

What is the meaning of "Wall Resolution" and "Wall Lift-Off"??

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how to draw a rectangle on a 3D cylinder's surface ?

hey ! we are working on the simulation of MEMS Based pressure sensor for biomedical applications. We are not able to create the heater element which will heat the liquid inside the cylinder. Kindly...

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No streamline is shown when "Magnitude controlled" streamline plotting

Hi, I've got something I can't figure out during a simple laminar flow simulation with COMSOL 4.3, so I ask anyone's help for this problem. The problem is that "sometimes" I cannot see any streamline...

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Error in Jacobian

Can I know what the error means??"Failed to find consistent initial values. Segregated group 1 Failed to evaluate operator Jacobian. Operator: nif, Geometry: 1, Boundary: 12 13 14 15 17 18 19 20 24 25...

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Comsol doesn't keep initial values

Hi Now, I work on a Comsol model describing a spouted bed apparatus (spouted bed is a kind of fluidized bed, when the apparatus has a conical bottom). I use Comsol 4.3 with Euler-Euler model, laminar...

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How to Improve Convergence in Natural Convection

I am wondering how I can improve convergence in my natural convection model. It is a simple model; an isothermal aluminum plate in water. The model starts out fine but as the run continues (transient...

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Pipe Flow Module

Can anybody let me know how to use pipe flow module in COMSOL 4.3a starting from basics with an example??

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