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Fluid solution mapping error in Fluid-Acoustic Simulation

Posted 11 giu 2025, 16:40 CEST 0 Replies

Théo Damour

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Hello everyone,

I am currently doing an Acoustic-fluid simulation with stationnary turbulent flow, convected wave equation and background fluid flow coupling modules. I have only one geometry for the whole study, in the first place i do the fluid simulation, then I map the fluid fields onto my acoustic mesh and finally I do my acoustic simulation with the background flow set up as a variable not solved for. My problem is that i already did many simulation using a simple geometry for my conduct (3D cylinder) which worked totally fine.

Now that I am using a more complex one based on CT-scans, I face issues during the mapping of my fluid fields onto the acoustic mesh. The error message is the following :

" Extrusion coupling operator interpolation failed for at least one point: no source point found. - Geometry: geom1 - Domain: 1 - Destination coordinates: [-0.00146266445760077; -0.0021864553895055991; 0.00060947754522279061], [-0.0014856891031490996; -0.0021811204460443394; 0.0006247936128450256], [-0.001450351221716216; -0.002194843619005469; 0.0006247936128450256], [-0.0014270113859349211; -0.0021981395225136669; 0.00060828294733559498], [-0.0014966022294479824; -0.00217111449601754; 0.00060828294733559509], ... Failed to evaluate expression. - Expression: withsol('sol1',comp1.spf.pA) Failed to evaluate expression. - Expression: (comp1.bffc1.p_map-withsol('sol1',comp1.spf.pA))dvol_spatial Failed to evaluate Jacobian of expression. - Expression: ((comp1.bffc1.p_map-withsol('sol1',comp1.spf.pA))test(comp1.bffc1.p_map))*(dvol_spatial) "

I understand that COMSOL struggles to find source point in my fluid domain but i can't understand why since my CFD simulation works fine and i have good results. Even with a mesh refinement of the source domain i keep having this problem, do you have any idea why and how I could solve this ?

I sincerely thank you for your time and your answers !

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