Free Surface Modeling
Hi all, I'd like to model a sphere dropping into a tank of fluid. Does anyone have any suggestions about how to do this? The main focus is when the sphere hits the fluid, how the free surface reacts...
View ArticlePressure Drop Results
My question has to do with interpreting pressure drop results for turbulent flow in a pipeline static mixer. Energy dissipation length is a relevant quantity in the design of static mixers, and is...
View ArticleTime Dependent Study- Flow Past a Cylinder
Hello, I am relatively new with COMSOL, and am trying to start off with the basics before I dive into my research using the program... I want to find the Strouhal number from a cylinder in a laminar...
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 ArticleMicrofluidics device for sorting of particles
Hi all, I am attempting to do simulations on microsorters based on dielectophoresis and magnetophoresis. I managed to do the simulation for just 1 type of particle but i'm facing issues setting...
View ArticleSqueeze flow: level set with moving mesh
Hello, I am new to the fluid module and am trying to simulate a liquid droplet being pressed between two plates where the plates are larger than the initial droplet (the other problem is much easier to...
View ArticleDifference between Time dependent and Time discrete
Hi, I am working on a conjugate heat transfer problem. By t=20s, the system reaches steady state. Then I would like to see the system response after t=20s, using step function to switch off a source...
View ArticleFluid velocity calculation in discrete fracture
Dears, Now I am simulating discrete fracture in a 3D space and I need to calculate fluid velocity inside fracture . So my question is should I multiply by fracture aperture during calculation or not u=...
View ArticleWater droplet falling through air on a structured surface
Hi, Im new to comsol. I was trying to model a water droplet falling onto a solid substrate. The droplet should fall through air and then i should be able to calculate contact angles at various...
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 ArticleTrouble coupling heat transfer physics for both fluids and solids
Hey all, So I'm getting stuck with my model where I try to couple three different physics. The three physics are: Electric Currents, Heat transfer in Solids, and Heat transfer in Fluids. Basically what...
View ArticleTurbulence in pipe flow
Hi, I am studying the Navier Stokes equation in the context of pipe flow. As of now, I am using Water, modeling it as incompressible, with outlet at 0 Pa and a parabolic inlet profile. (currently at...
View ArticleWeak Constraints from COMSOL 3.5 to 4.2a
Hi I have seen many posts regarding this but none had any definite answer. I am trying to follow a tutorial which involving Stoke's flow, and have the following problems: 1. "Go to Properties of mmglf...
View Articlefree convection problem help closed box
Dear Ziv, I am Joseph from Spain, and just saw a comment you posted 3 years ago about free convection in closed space. Did you finally solve the problem? i know how to do it with external convection,...
View Articletwo phase flow combined with porous media
Hi I have a 3D model of a DMFC channel. The physics associated with this channel are: 1. Secondary current distribution Cathode side: 2. Transport of concentrated species 3. Free and porous media flow...
View ArticleMultiphase Stirred Tank
Hello! I'm trying to simulate a stirred tank of water with air bubbles in 2D Axisymmetric model. But, In the bubbly flow module doesn't exist the condition "sliding wall" Can you help me with this?...
View ArticleLaminar to turbulent flow transition
Hi dear Fhtagn, I would ask you if you have resolved your problem with laminar flow module and how did you find the transition Re ? Thank you, Mehrez
View ArticleCoupling Stationary fluid flow and transient solute transport to AC/DC module
Hello, I'm not the most proficient COMSOL user yet, and I have a 2D problem in v3.5a that would seem to be rather simple but has proven difficult to me thus far. My problem is as follows: I want to...
View Articletwo phase flow through a micro channel
hi i have a discussion about the two phase flow in a micro channel with constant heat flux at one side of wall my aim is to find out the transition point..ie the point where the liquid change its phase...
View Articlehow to set wall to free stream boundary condition
I'm doing simulation of the heat transfer of Fuel Cell, I have an exhaust fan on the outlet and the inlet is the hole between the stacks, due to the thousand hole of it, i would like to draw a air hood...
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