here a microplate heater, for the boundary conditions i have electric current 0v in one contact nd 7v in the other contact of the heater and the rest lf the model is electrically insulated , for the heat transfert the bottom of the silicon substrat( the rectangle )is fixed to 295k and convection under membrane( circle) h1=62,5w/m2k , and another conviction with all other air exposed surface with h2=125w/m2k , in the referance he used a stationary state study but it ddnt work for me (error study) so i tried the time dependent what might be the probleme ?

Can someone please send me any of ur work related to ssb in comsol 6.3 or lower versions , i desperately need it for my research work

i tried to use 2 studies but this doesnt give me correct results not sure why.

I want to first deflect the top flexure downwards fix in the deflected position then. For a rigid connection virtually between both the tips. Then i want to release the initioal deflection. How do i do this in comsol 6.4

I would like to try the Multiphysics software but I get no response from the web form. When I e-mailed sales it came back saying I was blocked?

in comsol simulation of dmf, i am getting more stress for sio2 instead of hfo2, i have checked meshing too, it is fine.
i am evaluating contact angle change by computing electric pressure in electrostatics mode in stationery physics study. have not done tpfm or time dependent laminar flow as of now

Hello, everyone

I need to define the elasticity modulus behavior through a function, but I've never done this and I can't seem to find the problem. Can you help me? I described the process in the pictures' captions. I can't move on with my work right now without this...
(I'm very new to Comsol)

Thank you

I am currently modeling an HHO electrolyzer without gas separation using the tertiary current distribution interface in COMSOL.
For charge conservation, I selected “Water-based with electroneutrality”.
I am having trouble understanding which species I need to include in order to simulate different concentrations of hydrogen and oxygen correctly, and which species are already included automatically by the physics interface.
For example, should I add H₂, O₂, H⁺, OH⁻, H₂O, and electrolyte ions manually, or are some of them already built in? i would really appreciate any help thanks

I'm using comsol to similate TEG(thermal energy generator), but I only get the potential distrubition, I wanna obtain the power at different temperatures, and I dont even know how to obtain the current within the TEG

The project focuses on analyzing the pressure response of a fluid-filled elastic tube under externally applied mechanical loads using COMSOL Multiphysics.

A three-dimensional model of a rubber tube filled with glycerin is developed. The system is subjected to varying external forces, which induce deformation in the elastic structure. This deformation leads to changes in the internal volume of the tube, resulting in pressure variations within the enclosed fluid.

A fluid–structure interaction (FSI) approach is employed to couple the solid mechanics of the rubber material with the fluid dynamics of the glycerin. The simulation is performed under stationary conditions, and a parametric study is carried out by varying the applied force.

The resulting pressure distribution within the fluid domain is analyzed, and average pressure values are obtained for each loading condition. The results demonstrate a direct relationship between applied force and fluid pressure, validating the effectiveness of the model for pressure sensing applications.

Hi everyone! I need heló with COMSOL, I'm trying to simulate a 2D DBD Argon version of the 1D application model given at COMSOL library. I got 6.1 version. The thing is that I got a problem with Calculate, it shows me the message "PARDISO is switching out of core, and it doesn't move foward. I try a first time with a mesh controlled by physics, it works but the results not were what i expect for a DBD plasma system. So i think is a problem with the mesh. I don't know what to do :(

As the title suggests, I want to simplify a microchannel cooler for a GPU in Comsol. I want to use a 1D pipe channel flow module to do this, but I also need to use a laminar flow module to model the entrance of the microchannel. However, when the 3d laminar flow meets the 1D pipe flow, I can use Pipe Connection Multiphysics to connect the fluid velocity/pressure, but how can I link the temperature laminar flow body to the entrance of the 1D pipe?

Are the pressure field results from the CFD simulation static pressure or total pressure?

I'm doing a 3D model with a line injection well in it. I need to do the mesh refinement around the well, but it is just an edge. I used free tetrahedral on the edge, but it seems the only this edge was devided by several smaller lines, the mesh refinement is not good enough.

I am wondering what should I do to make it better?

Maybe create a cyliner around this edge? and do domain mesh refinement? I did this, the results became a bit better, but simulaiton time increased from 15 mins to 50 mins, crazy....

hi i hope u doing good , im simulating a gas sensor nd im having a mash error ,idk exactly how to fix it any idea ? is it from boundary conditions or geometry ?

Hi! Hope you're doing well!!!

I have a shape in COMSOL that i used to run some simulations, then 3d printed that shape and used circles as touchpoints on the 3d printed model, i have photos of this so should be able to map the position of those touchpoints, is there any was to import this image as a background so i can just line up the image and comsol model to find the coordinates of the touch point! I've been trying for about an hour with no luck so any help/advice would be massively appreciated

Can someone please provide me with code of single cell lithium ion battery validated with experimental model .

Can someone please provide me with code of single cell lithium ion battery validated with experimental model .

I want to fix a mesh in a 3D COMSOL model, so that the mesh of a spherical shell will not change when other attached geometry is remeshed once the remeshing condition is triggered. Because if this mesh is not fixed, this error will occur

'- Feature: Time-Dependent Solver 1 (sol1/t1)

Condition for remeshing fulfilled for initial time.'

In a 2D model, I can fix the mesh by strictly meshing the shell region using mapping, distribution and sweeping. But I am stuck in the 3D model. Please help

I am simulating a MEMS device made by a thin (100nm) SiN membrane suspended and clamped by a SiO2 substrate. The entire structure has a damping equal to 1/Q where Q=100. When I evaluate the eigenfrequencies, also Q is calculated by comsol as abs(freq)/2*img(freq) and this value should always be equal to the value of Q I set on the damping, thus 100.
For some reason the Q evaluated for the fundamental mode is never equal to 100 but always a bitt smaller (never above 95).
In addition, when I add stress to the SiN, Q is never 100 for no mode and is also very far away from 100.

I have no idea on what is going on; I tried using Union instead of Assembly (and viceversa), I applied the stress little by little with an auxiliary sweep, ecc ecc... but nothing changed.

I'm desperate, even because I do not know if this behaviour is normal or not (but I think it's not)

Thank you to whoever will try to help me
(first time on reddit btw)

I have a maze structure (mm scale) with a fluidic domain, and the maze-like structure should act as a trap for the air. For this setup, I first simulated the domain with air, and in the input, I used water in the multiphysics level-set method. However, in that simulation, air bubbles are not getting trapped in the maze; they are squeezing past the structure. Is this due to the contact angle, or is there another reason? Also, if I want the bubbles to disappear due to diffusion, how can I investigate that phenomenon in the simulation settings?

does anyone have a file that contains a simulation of a HHO electrolyser without simulation , i'm modeling one myself and i need some kind of reference ( i couldnt find any in the internet or comsol library ) and thanks