Pipe Flow Heat Transfer Question
Hello, I am trying to simulate the temperature drop in water flowing through an underground copper pipe. I have access to the COMSOL laminar flow module and the Heat transfer in fluids as well as the...
View ArticleFlow+Electrostatic
I've try simulate in comsol version 4.4 the task is air flow through some electrodes and ground then cause the wind blow like attach file. My problem is when I simulate by my own the direction of air...
View ArticleElasticity Matrix for Silicon
Hi all, I wonder would someone be able to shed light on something for me. In Si material properties, the anisotropic elasticity is defined as a 6x6 matrix: {D11, D21, D31, D41, D51, D61, D12, D21, D22,...
View ArticleConfiguring Surface Charge (Coulombs) on particles in the Particle Tracing...
I am working with Particle Tracing with Fluid flow physics. In the Particle properties menu, the options are fairly limited. I can configure the particle density, diameter and charge number (Z) only...
View ArticleCyclical calculation of fluid flow
In my dielectric boundary discharge (DBD) model, electrostatics module and "transport of diluted species" module are used to calculate the electric field. Then, the results provide volume force...
View ArticleParticle Size Issue for Particle Tracing in COMSOL
Hi, everyone. I am facing an interesting issue in COMSOL : the radius of the particle I wanna trace does not change even I change the radius size/number. I am simulating a microfluid--droplet ejection....
View ArticleInvalid property value
Hello community, I have a problem when I run a simulation about particle tracing. Its about the particles in the laminar flow. I can compute the first step , laminar flow, with no problem. however...
View ArticleUsing the Subsurface Flow Module to simulate karstic systems
I would like to know if in the Comsol Multiphysics Community there is any example of application of the Subsurface Flow Module to karstic systems, Thanks in advance Carlo Gualtieri
View ArticleProblem regarding two phase fluid flow
This model is a basic fluid flow model. Even when I select the required files and load them into the software following the tutorial yet it shows " unexpected errors" and at some places " undefined...
View ArticleQuestion on the analysis of contradictory results
Hi, My simulation consists in passing a fluid in a path of variable form. However, for a speed "x", I get a 2D graph with a stationary study. But for the same speed, when I do a time-dependent study,...
View ArticleFluid-borne noise generation in turbine bypass line
I'm attempting to simulate the noise generated from fluid flow within a turbine bypass line. Due to the configuration and varying inner diameters of the pipes a combination of fluid induced noise and...
View ArticleHow to deal with discontinuous heterogeneous data in 2D geometry
I am trying to model two phase flow in a 2-D porous media. There are four types of sands in the domain and thus four different entry capillary pressure. The variation of the capillary pressure becomes...
View ArticleCalculation of Volume flow Rate of Oil in journal bearing tilting pad
Hello everyone! I am a new Comsol User and I have a question concerning the general calculation of a volume flow rate. In my example, I want to calculate the volume flow rate in an oil film. I have...
View ArticleMultiple-size particle tracing
Hello everyone I have a short question on the particle tracing module. Does anyone know that whether it is possible to simulat particles of different sizes in the same model. How to implement this...
View ArticleProblem converging a time dependent study
Hi Comsol community, I started using Comsol few months ago. I aim to model the mixing by diffusion of two ionic solutions in a Y microfluidic junction (to eventually model precipitation of CaCO3). I am...
View ArticleLaminar flow between two parallel plate with a rectangle step
Hi, I am new to comsol. I am trying to simulate laminar flow between two plates. In my model upper plate is moving with a constant velocity and lower plate is stationary and also it has a rectangle...
View ArticleNegative pressure values 2D laminar tube flow
Hello community! I do model 2D laminar air flow within compliant (flexible) tube with a constriction by introducing gauge pressure (relative pressure) boundaries (inlet pressure = 400[Pa] and outlet...
View ArticleCouple two transient studies: Using transient flow field in transport simulation
Dear Comsol users, it would be very kind if someone could help me (I spent several hours trying to find a solution). I want to use the results of study 1 (time-dependent flow field) in study 2...
View ArticleChannel with half water and air
I am new to COMSOL Multiphysics and want to model simple CFD channel already filled with half water and air. Also, water movement within the channel w.r.t air. Please guide me. Thank you.
View ArticleSkin friction drag in simulation of external flows in 3D slender objects
Dear COMSOL community, I am performing 3D external flow simulations at high Reynolds numbers (10^6 - 10^8) using RANS turbulence models such as SST. I am trying to validate the turbulence models and...
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