Reusing derived expressions
Hi, Is it possible to reuse the output of derived values in the expression of other derived values, to make the calculation more efficient?I have a model with magnetic fields, in which I excite...
View Articlehow to apply a recoil pressure in CFD?
I am dealing with laser welding simulation. I use a phase field method to track the vapor/melt interface. I can link the heat source to the interface with delta function, but:how can I apply a recoil...
View ArticleMixing Time Scale in Mixer Application
Dear All I'm using Mixer Application, after analyzing the project it shows us the mixing time scale Does anybody know that what is the "Mixing Time Scale"? I mean what exactly tell us and how we should...
View ArticleThermal expansion mass balance.
Hi,I am working on model which involves phase change. I can model that successfully, but I noticed mass is varying as the temperature varies. (makes sense as volume is constant but density varies with...
View ArticleIs it possible to change the angle of a Gaussian beam in an emfd model?
Hello, I was wondering if it was possible to change the angle at which a gaussian beam would come at a model's geometry. Or is it necessary to rotate the whole geometry of the model?I currently have a...
View ArticleAdjust colour range for post-processing
Dear all,I would like to adjust the colour range of the von Mises Stress such that it automatically shows the maximum and minimum stress values of the domain that is actually visible in the graphics...
View Articleerror:singular matrix
When i try to compute a stationary problem of a 3d model,singular matrix occurs,like: - Feature: Stationary Solver 1 (sol2/s1) Failed to find a solution. Singular matrix.For mesh-case 0 there are 29578...
View ArticleOptimization Module for heat transfer
Dear all,lately I am working on the thermal simulation of a solid material exposed to hot gases to validate some experimental data of around 12000 seconds run time. Inside the solid we measure some...
View ArticleModeling monoatomic layer material in comsol
Hello. I am working on a project to model monoatomic layered material such as graphene, standalone and with other composite materials in comsol.We are getting dimensional errors and warnings when...
View ArticlePhase Change in Time Dependent Study
I have created a time dependent study to model the change in temperature of a solid material exposed to room temperature air over 24 hours. Next, I added in ice around the solid material to function as...
View ArticleElectrostatic shielding by a spherical shell with a hole
Hello,I am trying to simulate what i've attached as a jpg. Essentially i want to test the electrostatic shielding of a thin conducting spherical shell filled with air with a hole on its surface. The...
View Article水下运动物体产生的水中压力变化Changes in water pressure caused by underwater moving objects
水下运动物体产生的水中压力变化，应该怎么仿真这种压力变化？Underwater pressure changes caused by underwater moving objects, how should this pressure change be simulated?
View ArticleHelp Beginner!
Hi guys I am a beginner and I use comsol for learning purposes. So, I would like to set up a simulation but I don't know how. I have a butterfly valve that controls the inflow of exhaust gases in a...
View ArticleHole on a spherical shell
Hello, I am trying to build a metallic spherical shell with a hole on its surface. The shell must be filled with a dielectric e.g. air. Can you recommend any way of doing this?
View ArticleHow can I extract the data from a defined variable?
So in my study i used parametric sweep and used this expression to calculate total deformation of the system: sum(withsol('sol2',dy,setind(t1,i),setval(t,1)),i,1,20) My problem is that i cannot find a...
View ArticleTerminal velocity question
I am trying to set up a simple test problem. A solid sphere falling through water, accelerating until it reaches terminal velocity. I am a fairly new user so I apologise in advance if I missed...
View ArticleMoving Mesh - Non-isothermal process with porous medium
Hi All, Do you have any idea that how I can have a moving porous medium attached to the wall on a non-isothermal process. Basically, my problem is pretty simillar to THIS EXAMPLE The main difference...
View ArticleDifferent particle-wall and particle-particle interactions
Hello!I am working with a microfluidic chip where I will flush two types of cells inside it. My question regards about different interactions between different cells.Let's say I have cell A type and...
View ArticleSubsea Riser
Hello everyone! I am having some problem to model a Subsea Riser. Basically it would be a long steel pipe that would have a catenary geometry when its sustented by its own weight. I would like to model...
View ArticleFlow Simulation - Membrane break
Hello I am simulating a transient high-speed fluid inside a manhole. By default manhole does not have any exit. The manhole contains idea gas only. I am simulating the velocity, pressure and...
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