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nonzero difference in join dataset

Hello,I am using the Join feature to find the difference between datasets. However, when I join two of the same datasets, expecting to get a difference of zero, the difference is nonzero. Why isn't the...

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How do I only use temperature values of center of mass of mesh element?

I'd like to only use temperature values of the central point in a mesh element. I know that I can use the centroid()-operator for a specific parameter, but how would I be able to change it globally for...

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Lithium ion Battery Report

I was reviewing the automatically generated report in Comsol and noticed that the variables have expressions as to how they are calculated but the "shape functions" do not have expressions, how are...

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Representing an infinitely long conductor as a 1-D body in a 2-D space

Greetings,I am currently working on a simulation of a very thin superconductor exposed to an external magnetic field. The 3-D space is symmetric along the z-axis, and thus can be modelled as a 2-D...

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COMSOL wont let me select walls for fluid flow (not applicable)

I am trying to find flow arouns an object. I have said object inside a block. The block is air, and the object is steel for now. Under turbulant flow, I cannot select the objects walls inside the block...

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Help regarding porous flow simulation

I am having difficulty setting up a problem wherein the inlet and outlet tubes have normal flow of air(as in a pipe flow) and middle pipe has porous flow( with sand as the medium and given porosity and...

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Equivalent impedance of a metallic tip

My question is the following. I am working with piezoelectric material, more precisely with transducers. I have built an analytical expression for my transducer based on the electromechanical...

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Problem with time dependence initial conditions

Hello all,I am trying to do a very simple model of 2 iron blocks in thermal contact where their initial temperatue value is T=0C and only one side (boundary) of one of the blocks is set to T=100C with...

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Change direction of heat flow

Hi everyone. I am new to using this software and need some help please. I need to simulate a heat flow in a solid for a certain time. But after a while, I need that the convective heat flow to come...

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Explicit specification of damping constant

I am modeling a MEMS resonator in 3D using the structural mechanics physics interface.Experimentally, the response of the resonator closely follows the classical model of a 1D damped, driven harmonic...

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Piezoelectric Energy Harvester 3D

Dear Altruits, I am trying to model 3D piezoelectric energy harvestor. The automatically generating plot is showing the electric potential of the model. But when I am trying to plot 1D plot using...

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How to consider the Thomson effect when I do Do numerical simulation of...

How to consider the Thomson effect when I do Do numerical simulation of thermoelectric generator

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"Underwater Acoustic" How to add hydrostatic pressure to The Official Case...

The Official Case Anechoic Coating, Application ID: 44201, Address: https://www.comsol.com/model/anechoic-coating-44201Dear all,I set my own simulation like the case model, but once I set the...

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"An Unexpected Error Has Occurred"

Hi,I have been trying to downlad COMSOL 5.5 to my 64 bit Windows PC. While I seem to download the program without any issues, every attempt to open it results in an message stating "An unexpected error...

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Legend window size

Hello Everyone, I want to reduce the legend window size. Legend window covered half of the results. I do not know how to do it in proper way in COMSOL. Please help me to fix this issue.Thanks

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How to define a temperature field

I want to stimulate the natural frequencies for a certain model. In the COMSOL I can just define the whole model as a certain temperature like 300K. But for my model, the temperature in each point is...

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Export to Paraview (vtk/vtu)

Hello,I am trying to export my results from Comsol to Paraview. However, when I export the results in .vtu format, I loose the internal boundaries of my geometry and it appears as a uniform block. So...

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Dividing Thermal Stresses problem into 2 study steps?

Would there be any downside in dividing a stationary thermal stresses problem into 2 study steps, where you first solve for only the heat transfer in step 1 and then solve only for solid mechanics in...

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Evaluating the average value of a dependent variable on a 3D boundary in a 2D...

Hello everyone! Thank you so much for your precious time.I have a 2D axisymmetric study, and I want to set a probe to measure the average value of a dependent variable on a boundary. However, I am only...

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How to use a step function in a time-dependent study?

Hello everyone! Thank you so much for your precious time.I have a time-dependent study that runs for 400 seconds. I am simulating flow through a pipe, and I want to change the flow at 100 seconds. For...

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