I am modeling a tube with an initial pressure of 16 MPa. Inside the tube, there are some Lagrangian parts. According to the CEL definition, voids need to be present inside the Lagrangian parts. However, I cannot define initial pressure for the voids, leading to a significant pressure drop near the Lagrangian parts due to the Volume Fraction tool and the different pressures between the void and water.
This issue arises because I want the water tank to maintain an initial pressure of 16 MPa, but the presence of void material causes unreasonable pressure peaks.
My question is: How can I stabilize the pressure inside the tube? I have tried adjusting the Linear Bulk Viscosity and Quadratic Bulk Viscosity in steps, as well as creating different contact types (with damping etc).
In the attached pictures, a simple model with one Lagrangian part shows that the problem is not severe. However, with more Lagrangian parts, pressure peaks can reach up to 100 MPa.
- Use a sufficiently refined Eulerian mesh, especially around the Lagrangian parts to improve accuracy.Apply adaptive meshing to maintain fluid resolution near the solid boundary.Reduce element aspect ratio to prevent numerical artifacts
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