Thermocapillary recirculation
Hello, I am a beginning user of COMSOL. Currently, I am trying to create a preliminary model of Marangoni convection, like this one available on the COMSOL site:...
View ArticleShear stress boundary condition
Hi, I am trying to solve a simple fluid flow problem. It involves marangoni effect. But, I want to make it simple and apply shear stress as the boundary condition, instead of solving coupled thermal...
View ArticleIll-conditioned preconditioner. Increase factor in error estimate to...
Hello when i run my model, it gives me the solution, however i receive a warning too:"Ill-conditioned preconditioner. Increase factor in error estimate to 18704635135.61623" i would be grateful if...
View ArticleSimulation in Finned Tubes
How to do heat transfer and flow simulation in Finned Tubes I tried a lot ; but i could not able to give correct boundary conditions. Please help me to solve this problem.
View ArticlePiezoelectric inkjet printhead (unknown physics and boundary conditions)
Hello everyone! I'm a newbie to COMSOL. Unfortunately, I'm experiencing some difficulty in trying to model a relatively simple problem in COMSOL, and I'd be really really thankful if anyone could help...
View ArticleModeling closed circuits with pipe flow module (linking inlet and outlet)
Hi Comsol experts, I an trying to model a closed pipe circuit consisting of a network of pipes, bends, valves, junctions and heat transfer areas. A pump is inserted to create the force (dP) to move the...
View ArticleHeat exchanger as object in pipe flow module
Dear Comsolers! I am currently trying to model a real pipe system using the pipe flow module - energy central with heat pumps generating heat, distributing heat through a pipe distribution network and...
View ArticleSimulation of Syringe
Hello, I'm currently working on simulating flow in a syringe but i am unable to move the plunger. I found similar problems(Piston-Cylinder) in this forum but none had any solution to make the plunger...
View ArticleFluid Piezoelectric coupling problem
Hello everyone! I'm a newbie to COMSOL. Unfortunately, I'm experiencing some difficulty in trying to model a relatively simple problem in COMSOL, and I'd be really really thankful if anyone could help...
View Articleerroļ¼Log of negative
Hi, I am getting the following error: Log of negative Function: log Failed to evaluate variable Variable: mod1.St, Defined as:...
View ArticleTIC Nozzle Simulation
Hi, I am a starter here, and trying to simulate the Nozzle flow by the new feature of this edition, High Mach Number Physics. I already came up with the contour of it and import it into the comsol. I...
View ArticleALE and Laminar Flow
Hi, I have been wondering lately whether it is possible to simulate with ALE and Laminar Flow interfaces the motion of an oject in a fluid. Let us suppose that we have a closed system, i.e. a domain...
View ArticleDielectrophoresis
Hi there. I tried to observe the particle movement effect through the "particle tracing for fluid module". However, the result of particle trajectories didn't show up any particle movement. Please...
View ArticleHow to express the Ergun's equation in one-demensional model?
hi guys. I'm totally new men in using comsol. I encountered a problem when I developed a one-demensional comsol model for simulating PSA adsorption. I don't kown how to choose the source module to...
View ArticleDifference between Outlet and Open Boundary condition for fluid flow
Hi everyone, I was wondering if one of you could explain the difference between the outlet and open boundary condition for fluid flow (single phase k-e). I've gone through the CFD manual but I can't...
View ArticleTwo Phase Fluid Flow Convergence Error half-way into solution
Hi All, Time dependent solver for Laminar Two-Phase Flow, Level Set crashes half-way through the solution with error message "last time step didn't converge". Do you know what could cause this? The...
View ArticleNavier-Stokes Simulation using Coefficient Form PDE
Hi: I need to simulate fluid flow in a triangular duct, but I need to run it on a high reynold number. The problem is that when I run the model using the default "Laminar Flow" physics tab, I need a...
View ArticleFiltration of nanoparticles in porous membrane
Hi all, I'm simulating the rejection of nanoparticles that pass through a porous membrane. I am using the physics of "Particle tracing for fluid flow" and "Laminar flow" and set up some particles...
View ArticleTo demonstrate a "sieve" at the particle tracing module
Hi all, now I'm trying to demonstrate a particle sieve using the particle tracing module. I expected that the particles bigger than the pore size of the sieve could be filtered and stuck on the sieve...
View ArticleControl Volume Finite Element Method (CVFEM)
Hi there! My background is the modeling of resin flow in fabrication processes for fiber reinforced plastics (composites). This can be viewed as fluid flow through porous media. Basic simulations are...
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