PROBLEM with Heat Transfer in Pipes
Hello everybody! I'm using the Heat Transfer in Pipes module for simulating a heat exchanger (with a U layout). While the global results seem to be correct, when I plot the temperature behavior on the...
View ArticleA problem with two physics.
Hello everyone, I am trying to simulate a simple problem which includes a fluid channel and a piezoelectric splitter. I used two physics: "piezoelectric devices" and "laminar flow", each of them works...
View Articlesphere
Hello I have contacted you many times but no response ,,I want to design 3D sphere oscillating in water by it self please guide me to do that Montassar, engmas83@yahoo.com 011-5174940370
View ArticleLubrication shell coupled with ODE
Hi, I have some problems in coupling the lubrication shell interface with a global equation. I'm using the lubrication shell to model a tilting pad: I impose the pressure on the borders of the pad (two...
View ArticleCoupling：How to couple Laminar two-phase flow with electroosmotic
Hello,everyone. I‘m trying to simulate a microfluidic chip using electroosmotic pump.Because I want to capture the result that water erupt off the chip into the air,so i introduce the physics— Laminar...
View Articlemass flowrate is non conserved
Dear all, I was trying to simulate the water flow into a system with two inlets and three outlets and I used the ''surface integration'' io order to compute the total mass flow rate and I found that...
View ArticleHow to support flexible tube.
Hi- I am doing a 3D FSI model on a simple branched artery with blood flow. I naturally want the artery to expand and contract as the fluid moves though. What is the best way to constrain the inlets /...
View ArticleConvergence problem with system of pde's: compressible flow + pde for density
Hi, Here is the problem: I am solving these equations having a periodic boundary conditions in a square. At the top and bottom of the square the constant velocity v0 and pressure p0 is applied. It is a...
View ArticleError simulating fluid flow through microsieve
Hi everyone, I'm newbie to COMSOL Multiphysics. I'm trying to anticipate when a microsieve is broken under fluid flow (blood filtering), but some errors keep occuring. Please help me! Thanks very much!...
View ArticleHelp with "Nonlinear solver did not converge"
Good day everyone! I am working on a multiphysics problem involving reaction engineering, thermal stress, fluid flow in porous media, and species transport in porous media. At a certain timestep, I...
View Articlefailed to find a solution when coupling heat transfer with fluids dynamic!!
Hi everyone I'm trying to model a transformer using multiphysic (thermal, fluid dynamic) modeling on Comsol. when using only the thermal modeling, (only using heat transfer physics) the program is...
View ArticleTANK CONTAINING 2 GASES SUBJECTED TO ACCELERATION OF GRAVITY IN THE...
Hi guys, I have a tank containing oxygen in the left side and hydrogen in the right side and the interface separates the 2 gases initially and they are not mixed together. The initial conditions: 0...
View Articlesimulating a moving body in a flowing field
hello, I need to simulate flowing compressible or incompressible fluid in a circular pipe, containing two solid bodies moving by the drag force deduced by the fluid. The diameter of the bodies is the...
View Article3D SPF Convergence Issues
Hello, I'm working on a 3D model in an attempt to simulate water waves in a tank generated by a sinusoidal pressure source. I've been able to create an otherwise equivalent 2D model which works, and...
View ArticleLaminar flow error
Hi,Ivar I'm modeling the laminar flow in a simple rectangle(width 0.075mm and length 20mm). After the default conditions,I add a Inlet(Laminar inflow with a average velocity 0.2mm/s),and an...
View Articleplot transient solution
Hello, I have a problem to plot my transient solution and I hope someone can help me. I am solving a transient two-dimensional advection-diffusion problem through the transport of diluted species...
View ArticleON-OFF function and txt loaded file
Hello, I'm Stefano Casson and I'm using COMSOL to model the behavior of a heat storage in the gravel: my intention is to use a function as an input of temperature (I chose the interpolation) so in this...
View ArticleON-OFF function and txt loaded file
Thanks for the tip: very useful!But the problem lasts when T<30°C: if I put 0 in the expression, this zero is a value for COMSOL, and actually I would like to stop the injection, not to inject air...
View ArticleHow to get deposition rate of particles in fpt module? Or should I use an...
Hi I have been doing a model using the "fluid flow" and "particle tracing for fluid flow "module. A bell type insulator is placed across the flow channel. I have implemented the boundary condition to...
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