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An empty cavity was created

I am doing cfd analysis in a filter considering laminar flow .During mesh process with coarse the meshing was successfully but when changed to normal or coarse i am getting error as ''An empty cavity...

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More verbosity from errors

Hello im pretty new in COMSOL and Im having problems settting up a model. Working with turbulent flow + reacting flow I have the error Problem setting up multigrid Analysis x has no mesh defined for...

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Unable to understand this error

Hi all, I am new to Comsol and I am trying to give a 3D laminar flow(spf) with time dependent studies in a cluster. I am using Comsol 5.2 and I am getting the following error. Current Progress: 0 % -...

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Reactive transport modeling in COMSOL

Hi, I am new to COMSOL and Reactive Transport Modeling. I am confused about which physics should be used which corresponds to dissolution of boundary in response to reactive flow? Thanks Priyanka

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Creeping flow sliding and moving wall

Hello everyone, Im using the creeping flow module to simulate a sphere in fluid that is translating along one axis (say y) and rotating about one axis (say z), simultaneously. I have successfully done...

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phase change

dear sirs, my problem is cooling and dehumidification fan coil the flow inside tube water and outside is moist air with relative humidty so which physics should be selected to solve the mass transfer...

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How to remove a subdomain?

Hello, can anybody tell me how to remove (delete) a geometry (subdomain) out of my model? Tank you!

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Interior wall in free and porous media flow physics

I have filter model which i did cfd analysis in both laminar and free and porous media flow . The red marked part (attached below) is rectangular plate which acts like a interior wall where the...

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Solvers in COMSOL

Hello everyone! I am a newbie who seeks help in COMSOL. I have simulated a laminar flow in an annulus using direct solvers. The results match well with the problem (taken from Bird Stewart Lightfoot)....

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Trying to model contact in two phase moving mesh

Hi, I am trying to model contact in a two phase moving mesh problem. The model I am having most problems with now consists out of four geometries of ABS plastic at elevated temperature, which I am...

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Unable to evaluate an expression

Excuse me, I am getting an error as Attempt to evaluate real square root of negative number. Function: sqrt Failed to evaluate expression. Expression:...

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Volume Integration and Surface Integration

What is the use of volume integration and surface integration for the parameters like temperature, pressure and velocity??

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volume intergation of velocity

Hi I have defined variables SPF.Q (intop1(u)) for getting flow rate which is m^3/s but i am getting m^4/s .I don't know why because integration of velocity gives flow rate but i am not getting flow...

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creating geometry

Hi everyone, I want to create a geometry which is a straight cylindrical duct with openings(ie.,circular holes) provided at some locations in the curved cylindrical wall. Basically the purpose is to...

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Forchheimer Drag 1

Hi i am doing cfd analysis for a porous media filter ,I got the answer but my flow rate is so high than the actual flow rate of the filter so then i used forchheimer drag for porous media so that i...

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Simple Question for Flow Rate

Hello, I already done a few simulations with "laminar flow" using time dependent with rectangular input. Input was "pressure, no viscous stress". Is there any ways of getting the flow rate from...

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unknown property warning

Hi , I was wondering if anyone is familiar with this warning in the log window : " Warning: Problem encountered during results while solving. Unknown property. - Property: usetunit " It gives me the...

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heat transfer

Hi all; I am trying to model a 2D simple heat transfer problem where one side of a square is heated, melting a material. The material starts as a solid, so there would be conduction, but then as it...

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2D air movement in room with heating and ventilation

Hello, Last week I took my first Comsol course so I am quite new to the programme. I try to model a (simple) 2D model of a room with room heating (a steel heat source), ventilation and direct sunlight....

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SIMULATION OF NANOPARTICLE ADHESION THROUGH LAMINAR FLOW BETWEEN PARALLEL...

Hello everyone, We are trying to simulate nanoparticle adhesion to substrate(the bottom wall of the rectangular channel, with cylindrical inlet and outlet on the top wall). We are using Laminar...

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