Find answers, ask questions, and connect with our <br>community around the world.

Home Forums Introduction to FSI Forum question about fvscheme with dynamic mesh

• # question about fvscheme with dynamic mesh

Posted by on February 19, 2024 at 12:09 pm

Hi support team,

In lesson 13, with dynamic mesh solver, why in fvscheme the laplacian scheme, it has two terms, velocity and displacement. Since dynamic mesh only includes a mesh velocity in the equation. Can you please explain how the displacement is included in the laplacian term? Thank you

Regards,
Xin Xiong

replied 1 month, 3 weeks ago 2 Members · 2 Replies
• 2 Replies
• ### Chennakesava

Member
February 20, 2024 at 10:15 am

Hi,

We need only the displacement one. The fluid mesh is solved for new positions of the mesh nodes, and then velocities are calculated from the displacements using time integration schemes.

The code for the velocity was left there to help with the syntax.

• ### Xin

Member
February 20, 2024 at 10:39 am

I still don’t understand, as the equation show below, only velocity is needed in fluid solver. As my understanding, the process is as follows:
1.fluid solver solve with added velocity only for dynamic mesh as equation shows,

2. then force is calulated based on the fluid solver.
3.And then solid solver in this case as Newmark solve the ode to calute the velocity, displacement and accelarate.
4. displacement is implemented to the dynamic mesh.
5. go back to 1

…….
so my question is why there is displacement in fluid solver.
Thank you

Regards,

Xin Xiong