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Questions related from Nitish Katiyar
"In the FEM simulation of a micro-perforated plate (MPP) absorber, is it necessary to include the end correction factor typically used in theoretical models to match experimental results, or does...
17 October 2024 9,601 4 View
Please see the attachment. From the equation, it is clear that for very low frequencies, there will be some regions where STL will be negative. However, negative STL is a violation of energy...
22 October 2023 7,365 4 View
I have a narrow domain with varying cross-sections. So, I can't use narrow-region acoustics. I am using thermo-viscous acoustics. But I am unable to create boundary layer meshes due to a computer...
21 June 2023 7,070 2 View
Ideally Pure metals have sharp melting points. But there will be some variation in the melting of pure aluminum. I want to know the temperature transition zone half width for aluminum.
19 June 2023 7,658 4 View
I need these properties for COMSOL simulation. Constant pressure heat capacity Density Thermal conductivity Transition temperature between two phases Melting temperature Latent heat of fusion.
10 June 2023 4,947 3 View
Usually we evaluate sound absorption coefficient using two microphone impedance test tube. And sound transmission loss using four microphone impedance test tube. Is it possible to evaluate sound...
07 March 2023 1,702 5 View
Is there any relationship between stl and absorption coefficient? Suppose i am getting a peak at 400Hz (90% absorption) then at the same frequency what will be the sound transmission loss(it will...
04 March 2022 2,801 6 View
My design contains three parts. A silicon rubber membrane is placed between upper and lower part. I want to calculate sound transmission loss by using comsol Multiphysic. There are lots of...
06 February 2021 852 4 View
I have 1 mm thick membrane. This membrane is perforated. I want to simulate this in Acoustic module of comsol. For this ,which type of module I can use in comsol.?
03 February 2021 2,780 6 View
Activated Flux Tig welding . In the research paper it has been given that paste is made after mixing silica powder in acetone.But when I am doing this then .Paste is not being made...
22 October 2018 9,093 4 View
I want to simulate this using the Acoustic structure interaction module. For ease this can be done by taking a single unit. How can I do this in comsol?
01 January 1970 1,745 8 View
An example of achieving negative effective mass density is membrane-type acoustic metamaterials, which exhibit a negative mass density below the cutoff frequency. We plot it using the formula...
01 January 1970 7,207 1 View
Suppose I have a metamaterial of thickness 20 mm. While simulating in comsol, I have to connect it with upstream dome and downstream dome with same dimension as used in impedance test tube...
01 January 1970 6,329 0 View
