🔊 COMSOL Tutorial: Sound Transmission Loss of a Muffler with Mean Flow 🚗

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🔊 COMSOL Tutorial: Sound Transmission Loss of a Muffler with Mean Flow 🚗💨
In this video, I explain how to calculate the sound transmission loss of a muffler with mean flow using COMSOL Multiphysics. The simulation uses the Linearized Navier-Stokes, Frequency Domain physics, along with Fluid Flow, Stationary, and Mapped Mesh interfaces.

To accurately capture the interaction between flow and acoustics, we need to run three separate studies:

1. Fluid Flow (Stationary) – to solve for the mean flow
2. Mapping Mesh – to map the solution between interfaces
3. Linearized Navier-Stokes (Frequency Domain) – to compute the acoustic response

Finally, I will compare results with Pressure acoustics physics

💡 What You’ll Learn:
✅ How to simulate acoustic wave propagation with mean flow
✅ Setting up linearized acoustic analysis
✅ Using mapped mesh for interface coupling
✅ Extracting transmission loss from the results

📥 Download COMSOL Model:
https://www.dropbox.com/s/o14n8mweh4e...

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The variables and formula
variables
k0 lnsf.omega/(lnsf.c0+Uin) "Convected wave number"
pb 1[Pa]*exp(-i*k0*x) "Background acoustic pressure"
ub -1/(lnsf.iomega*lnsf.rho0)*d(pb,x) "Background acoustic x-velocity"
vb 0 "Background acoustic y-velocity"
wb 0 "Background acoustic z-velocity"
Tb lnsf.alpha_p*lnsf.T0/(lnsf.rho0*lnsf.Cp)*pb "Background acoustic temperature"

Transmission loss formula
20*log10(abs(intop_in(pb)/intop_out(lnsf.p_t)))

0:00 1:09 Introduction
1:10 2:24 Pressure Acoustic
2:25 5:22 Fluid Flow
5:23 7:40 Geometry Preparation
7:41 9:32 Defining PML
9:33 12:32 Linearized Navier-Stokes
12:33 14:23 Study for Linearized Navier-Stokes
14:24 15:55 Results
15:56 Finer mesh
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