The routine solves a three-dimensional convected Helmholtz wave propgation problem, which represents the acoustic radiation from a generic turbofan engine intake. The wave propagates through a non-uniform mean flow with a given mean density $`\rho_0(\mathbf{x})`$, speed of sound $`c_0(\mathbf{x})`$ and velocity vector field $`\mathbf{v}_0(\boldsymbol{x})`$. The mean flow is assumed to be subsonic so that the condition $`\| \boldsymbol{v}_0(\boldsymbol{x}) \|/c_0(\mathbf{x}) < 1`$ holds. A version without mean flow is available in the folder `example/helmholtz/nacelle3D`.
The routine solves a three-dimensional convected Helmholtz wave propgation problem, which represents the acoustic radiation from a generic turbofan engine intake. The wave propagates through a non-uniform mean flow with a given mean density $`\rho_0(\mathbf{x})`$, speed of sound $`c_0(\mathbf{x})`$ and velocity vector field $`\boldsymbol{v}_0(\boldsymbol{x})`$. The mean flow is assumed to be subsonic so that the condition $`\| \boldsymbol{v}_0(\boldsymbol{x}) \|/c_0(\mathbf{x}) < 1`$ holds. A version without mean flow is available in the folder `example/helmholtz/nacelle3D`.
### Mean flow
The mean flow is computed externally, and given by a data file (e.g .pos or CGNS) which is read by Gmsh as a pre-processing step.
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@@ -49,8 +49,9 @@ By default the `bpf_ratio` is 0.5 and the mode number `m` is 6.
## References
> Marchner, Philippe. "Non-reflecting boundary conditions and domain decomposition methods for industrial flow acoustics." PhD thesis, Universités de Lorraine et Liège, 2022.
> To be updated
## Results reproducibility
The data from Figure 4.3 for the intake problem can be reproduced by running the domain decomposition problem with the associated number of subdomains.
The data from Figure 4.3 for the intake problem can be reproduced by running the domain decomposition problem with the corresponding number of subdomains.
Sufficient computational resources are needed to run the cases.
