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Meaning for some parameters
Hi, I am doing some simulation about microfludics and I used laminar flow, however, I don't understand some terms. What's the meaning for 'Entrance thickness'? I used 2D simulation. Looking forward to...
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Impedance in RF module & Transmission Line module
Hi ! I am currently on a project. I am trying to model human liver and the reaction of tissues due to the heat. There are models already set up in COMSOL. They are called "tumor_ablation" and...
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Expression for microwave absorbed power by plasma
Hi My work is on mw excited plasma. I want to know that how much mw power is absorbed by the plasma. So which expression, I should use? Thanking you.
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Effective index imaginary part doesn't appear.
Hi I am trying to measure the confinement loss in a photonic crystal fiber using the fundamental mode effective index. for a wavelength 1.55um and upwards, the fundamental mode has an inedx of...
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Beam Envelope vs Frequency Domain
Hello everyone, I have a big doubt about whether it's bettere to use the Beam Envelope or the Frequency Domain Physics to model an optical Add-Drop filter. I need to simulate the behaviour of the...
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How do we set the axis in comsol 5?
Hi I want to limit the x,y axis in comosl 5? I cant find a way to set the axis manually.
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Help with two ray coupling in the geometric optic physics
Hello, I'm modeling an interferometer with two rays, one of 650[nm] and other with 420[nm] but one can only put one Ray Properties in the GOP, I put two Release from Grid components to generate the...
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Wrong temperature profile time dependent study
Hi! I am modeling the temperature distribution inside a layer of biological tissue. The geomtry is a cube. I put a temperature BC of 78°C on one of the face and a temperaure BC of 37°C on the opposite...
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Modeling of resonant absorbtion
Hello, I am wondering if it is possible for COMSOL to model the resonant absorption of protons in a static magnetic field. For example, if I had a 1T field along the Z-axis with a water phantom inside,...
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Selecting geometary objecs inside another object
I'm using COMSOL 4.4. Normally after clicking several times, we can select a "buried" domain or boundary (as I did in version 4.3a). But the problem is this way does not work any more now. Is there any...
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Time-Dependent Modal with short initial impulse
Hi @ all, it is possible to perform an Time-Dependent Modal Study with a short initial impulse e.g. a Gaußimpulse? I want to perform an attenuation analysis and start with a forced oscillation because...
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About the color scale bar
Hi All, I have a question about color scale bar in the final simulation results. After I finished the simulation I can get a linear color scale bar. I plan to change this linear color scale bar to the...
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pH profile considering buffer effect
Dear COMSOL users, I am pretty new to COMSOL and I would like to simulate an electrochemical reaction where OH- ions are formed in the reaction and the whole reaction occurs in a buffer solution of pH...
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Reusing solution displacements - should be easy... help please!
I have a problem which should be very straightforward but I cannot get to work. I want to solve a 3D structural mechanics frequency domain problem, and reuse the velocity of particular surfaces in...
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Adding a material after heating
Hi all, I have a 2D hemisphere that I want to heat up in air. The flat edge is heated with a constant power of 100W. After 60 seconds I would like to introduce a curved piece of copper on the curved...
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simulation a surface reaction in a continuous catalytic wall reactor
Hello, I am new in Comsol and I am trying to simulate a heterogeneous catalytic process in a continuous catalytic wall reactor. The reactor is a flat plat which one of the walls is coated with...
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Thermal simulations: watt per second.
Hello, I have modelled an IC and I would like to set a block in my model (the IC) that produces a heat wave that is spread through the other components: PCB, solderballs, etc. I am using the 'Heat...
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Setting pressure
I want to study flow in pipe I want to set v = 0.05 m/s AND p = 5 atmat the inlet How to set them both? I mean, under laminar flow -> inlet -> boundary conditions I can choose one or the other,...
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releasing particles along depth of a well
Hi, My model is 3D, and I want to specify in particle tracing module to release particles from this specific location which has coordinates (x,y,z) and I want to impose to release particle every 10 cm...
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Set the result of one computation as the initial value of another
Hi everyone! I am doing a simulation of the flow in a complex structure tube. I have finished the computation using k-ε as the turbulence model. Then I want to use its result as the initial value of...
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