Vibrating sphere in water
Hi everybody I am new user, I am trying to simulate Tank of water and inside the tank vibrating sphere , could anyone help me with that Thanks
View ArticleTwo-phases Flow in a PEM Electrolyzer
Hello everyone, I am trying to model a proton exchange membrane water electrolyzer in comsol (2D model) to have the void fraction mixture flows (Oxygen+Water). For that I use the Bubble flow model of...
View ArticleModelling a partially submerged paddle wheel
Hi all, I am a COMSOL beginner and am hoping to get some advice on how to use the Rotating Machinery, Turbulent Flow module to model the movement of a paddlewheel through water at a water/air boundary....
View ArticleFind the start time of an event
Hi all, I am working on a model in which hot liquid from a source flows on an free surface and cools over time. I need to find the time when the fluid temperature drops to a certain point. And the...
View ArticleFSI-Acoustic Radiation Analysis
Hi everyone, I am working on a simulation that analyzes the effects of an ultrasonic wave (50 MHz) on structures within the vestibular system. I am using the FSI physics instead of the ASI physics...
View ArticleRF field - initial value - comsol 4.1
Dear forum, I ask for an advice in the following things: 1) Is there a predefined Poynting vector in RF module?& where exactly can I list through the comsol-names for physical quantities? 2) I have...
View Articleproblem in boilling of water... need help
I'm not able to run this simulation. If anyone can help me to run this simulation, it would be a great help.!! Thanks in advance. -- Surjendu Maity IIT-G INDIA
View ArticleGravity
I am modeling two acoustic horns with an air volume in between them. I am curious, do I need to assign a volume force for gravity (-g_const*rhoair) to the laminar flow node if I am assigning gravity to...
View ArticleContact of two compartments with narrowing fluid section
Dear All, I am trying to create a time-dependent contact model of two solid sections, initially not in contact. In the middle, there is a fluid compartment that will narrow while the two solid sections...
View ArticleFluid flow mass balance not conserved
I'm having issues getting COMSOL to strictly adhere to a specified inlet flow rate, and for some reason the resulting outflow from my system is also incorrect. I'm working on a 2D axis-symmetric fluid...
View ArticleMass conservation in deformed geometries
My problem seems quite simple. I have a domain of water at a concentration of c (dilute specie). My model requires a reduction of the size of the full domain to half. In order to do this I tried using...
View ArticlePhase change material inside a Pipe flow
Hi all, I need to simulate a phase change material inside a pipe flow (liquid -> gas). So, the transformation is isothermal. I would like simulate the cooling of a concrete slab with a heat exchange...
View ArticleHelp on temperature control with pde
Hi all, I am working on a problem, in which hot fluid is flowing as a thin film and being cooled. I use two coupling PDEs to solve the film thickness and the temperature∂H/∂t= ∇.F(H) H...
View ArticleFactors for Convergence
hi I am solving a time-dependent problem on flow through porous media using two phase darcy law. I want to know whether the time range for the study affects the flow or convergence of the solution....
View ArticleFluid flow interaction with gravel (solid)
The aim of the simulation is to determine the shear force needed to cause uplift and drag force of the fluid (water) flowing past a solid (gravel material of size 3.35mm) -- This is to understand what...
View ArticleTwo Stream Simulation
Hey, everyone. I've been using COMSOL for about 2 weeks now and needed mostly to teach myself how to use it *for summer research*. I'm having trouble running this simulation that's attached. The...
View ArticleMeaning for some parameters
Hi, I am doing some simulation about microfludics and I used laminar flow, however, I don't understand some terms. What's the meaning for 'Entrance thickness'? I used 2D simulation. Looking forward to...
View Articleinterpolate temperature between boundaries in molecular flow
Hello, I need to determine the temperature of the gas entering a the rotor blades of a TMP. I know the temperature distribution at the steel walls of the pump port from a prior transfer simulation....
View ArticleHow to deal with the flow field and get the pressure drop in...
Hi, Everyone. Attached is a simple magnetorheological fluid valve model (Comsol 3.5a) with an uniform magnetic field (already obtained), but the errors occured as follows when the flow field was...
View ArticleSpeeding up post processing
I am trying to populate a 3D velocity vector field. Anytime I change the time period I literally sit here for about 15 mins while the file re-plots. My file is 22 Gb in size, but the problem I believe...
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