Marangoni Stirring / Phase Change: Weak Contribution Settings
Hi I have a problem with a weak contribution in a laser surface melting model: My model takes into account solid-liquid phase change using an enthalpy-porosity technique and liquid phase volume forces...
View ArticleMoving mesh ALE
Hi, I am simulating a moving boundary with ALE method. My program is working fine with a certain geometry, mesh and time, but if I would like to change the geometry or set a larger time, then I get a...
View ArticleMagnetic Field Simulation
Hi, i'm currently trying to do a mf analysis of the system in append figure. The four quadrangular structures are coils with a external current applied. I defined all the domain's material and added...
View ArticleDefine a function like Linear elastic-perfectly plastic behavior.
How can I define a load which increase linearly up to time t0 and then stay fix by time. I defined something like "F*(rm1(t<t0)+step1(t))" which step function location is time t0. the only section...
View ArticleRecreating Jet Flow in COMSOL
I have temporal and spatial velocity profiles that I would like to try and recreate in COMSOL. At 0mm from the nozzle (d = 2.4 mm) the velocity is 110 m/s and at 12 mm the velocity is about 100 m/s. It...
View ArticleTracking two phase flow of bubble and moving free surface
Hello - I have a question regarding the use of the Level Set Method for Two Phase flow in COMSOL 4.3? I have included a figure to explain the question. I have a flow domain with two fluids (called...
View ArticleSwirling Flow Around a Rotating Disk
Hi all, first time I've posted here! So I've been working through the Swirling Flow Around a Rotating Disk Model:www.uk.comsol.com/showroom/gallery/616/ It's really impressive. I'm just wondering if it...
View ArticleComsol RF module norm and phase
Dear all, I have a problem with Comsol, a very naive one. I am trying to do a harmonic simulation (a single frequency in frequency domain model) of the EM scattering in a domain. For example if I have...
View Articleparticle deformation througn a contrained channel
Hi there, I am doing COMSOL simulation to see the behavior of a particle flow through a microchannel. There is a area of the channel where particle size is greater than the cross section. So the...
View ArticleHow to generate pulsed laser in Bioheat Eq.
For Bioheat equation, there is one parameter which I can input corresponding to laser source, Q_ext (spatial heat source) In this part, I typed the equation of laser radiation below,...
View ArticleSkull and Electrical Conductance
Hey, I'm just a beginner with Comsol and I'm trying to build a model of a human head that includes a top layer of skull, a brain, and space in between the two filled with some kind of conductive...
View ArticleDuplicate variable name
Hello all, I got some duplicate variable name error when computing my model(see the attachment), which including the piezoelectric device, laminar flow and deformed geometry. Should I use the physics...
View Articleco-efficient of thermal expansion
Hello evrybody, Can anyone help me to know if I can input my co-efficient of thermal expansion as a function of Stress and Temperature or not. And if possible how to do that. Thank you.
View ArticleOutput pressure of the transducer adding Vac + Vdc
hello, I 'm working on a capacitive transducer, using the electromechanics(emi) model. Now I want to observe the output pressure of the transducer in the frequency domain and I add a voltage V=Vac+50...
View ArticleOut of memory during LU factorization
Hi there, I am a new member in the COMSOL community. I am trying to solve a simple 3D problem having diffusion and chemical reaction within the subdomain. However, I am getting this message "out of...
View ArticlePiezo Loading
I have a 3D piezo model and the output is currently a floating potential. This tells me the theoretical unloaded voltage gain. I'm working on possibly using a global equation of a simple ohms law...
View ArticlePlacing a finite element model into an electrical circuit in COMSOL 4.1
Hello, I have recently made the switch from COMSOL 3.5a to COMSOL 4.1, and I am currently unable to do things that I used to be able to do very easily, namely placing my 3-D model (drawn and defined in...
View ArticleMark my experimental values to the curve point in the plot window of COMSOL
Hi Everybody The purpose of my question is to compare the theoretical curve obtained on COMSOL with my experimental values on the plot window. I have a curve point on the plot window. I have a few...
View ArticleGravity effect
Hi, Sorry for my newbie question. I'm trying to simulate 2D two-phase flow in porous media. I'm wondering whether COMSOL considers gravity effect when applying Two-Phase Darcy's Law physics. Thank you,...
View ArticleAbout optical force calculation of particles manipulated by microring resonator
Hi,everyone. I want to simulate a structure which includes two bus waveguides and one microring resonator to form an on-chip optical tweezer. One microparticle is placed in the gap area between one...
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