Meaningul drag output
This is a working stationary turbulent flow model. I have created an integral solution set around the boundaries of the object id like to determine lift and drag for. All posts i have read involve...
View ArticleMeshing in matlab
Hi, I am having real difficulty to control my mesh in matlab. Basically I don't have any control over it. Its quite a simple model but im finding that if I change the numbers in the code, I get the...
View ArticleNavier-Stokes Simulation using General Form PDE: The Continuity Equation
Greetings all. I am working to solve a standard fluid flow problem (e.g. flow in a pipe as a start) using the General Form PDE interfaces instead of the Fluid Flow built in GUI. I am able to define a...
View ArticleHow prevent an object from penetrating another object?
The attached file has a simple case that is a precursor to what I really need to model. The simple case consists of a membrane (hyperelastic material model) with a small quartz bead located a short...
View ArticleUsing interpolation tables for temperature dependent structural and themal...
This will eventually be an analysis of the thermal and structural very steep pulses but for now I am keeping it simple. (stationary and moderate time dependent loads) In trying to defining some basic...
View Articlereaction is not happening in tubular reactor
Hello guys, I have designed a tubular reactor in comsol 4.2 but after computing it doesn't show any variation. my reaction rate id not changing my conversion is not changing. only axial flow velocity...
View ArticleVCCS
Dear all, I simulating a 3D electrode model and do not know how to use voltage controlled current source (VCCS) under electric circuits (ec). Can anyone help me where can I find examples using the...
View Articleeigen frequency
I'm able to get frequency in complex no can i able to get it in real no only
View Articleanalysis
I unable two get the same resonant frequency for eigen frequency and frequency domain solver
View ArticleLithium ion battery 1D model: solver error
hi, I am trying to solve the Lithium ion battery model from the model library (li_battery_1d). I am always getting this error message while solving study1 in it .Please help me on this. Repeated error...
View Articleapplying a magnetic field
Hello, I would like to know how to apply a magnetic field on metal electrodes of a Surface acoustic wave resonator using COMSOL 3.5 a. Thak you
View Articlecreating a coordinate system in the matlab console
Hello everyone, is there a specific function for drawing a coordinate system over the Matlab LiveLink in the Matlab console? I'm not yet familiar with all the functions concerning the LiveLink. My aim...
View ArticleDistance between two points
Hi ! Suppose I put two circles at position (0,0) and (0,2). If I rotate the second circle with respect to first(0,0) at a range (0,60,360), it gives a hexagon.Is there any way to confirm the distance...
View ArticleGenerating thermal resistance and thermal capacitance of model; OR import...
Hello everyone, I've been trying to control a heat exchanger model build with comsol. The idea is to control the temperature of the fluid running through the aluminium heat exchanger heated by two...
View Articlemodeling a Non-Newtonian fluid in rotating machinery
I modeled a rotating machinery and defined Non-Newtonian fluid in model. Unfortunately, when I run the model this problem occurred: Failed to find time step so that given tolerance are satisfied. What...
View Articlesplit a rotating machinery
I want to split a mixer (rotating machinery) into 4 part and then define a unique particle tracing physics for each part. How can I do this?
View Articlenumerical oscillation in modelling corona discharge with coefficient form...
Hi,everyone I,m working on modelling corona discharge in air with coefficient form PDEs and Electrostatics interface. I'm encountering the problem of numerical oscillation in the simulation area...
View ArticleSchiller Naumann with Mixture Model
Hi folks, I have been trying to use the Schiller Naumann with Mixture Model to simulate a particle flow in water. I have previously used the Hadamard-Rybczynski model with smaller particles (Rep <1)...
View ArticleElectrostatic Precipitator... Help!!
Hello I want to simulate an Electrostatic Precipitator. In conditions of laminar flow field and electric filed, it is requierd how many particles are gathered. However, in my simulation, the efficiency...
View Articleerror: The object 'Type: Save Point Geometry Tag: geom1' is not contained in...
Hi all- I have been working on a model for some time, and just trying to optimize the solver settings. I saved the model today, and then opened it up again to work on it, and now get this error for any...
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