Should a surface like the deck of our boat (to close the volume) be removed from our hydros surfaces meshing ?
How can we create a good and representative meshing on our hydrodynamics surfaces ? What are typical values for nu and nv ?
It is highly recommended to have a closed volume. However, you can use a very coarse mesh for all the surfaces which are not supposed to be in the water (such as the deck).
Regarding nu and nv, you can perform a mesh convergence study to determine them. I.e. start with a coarse mesh, with nu and nv chosen so that the quad elements are not completely stretched in one direction or the other, and report the hydro forces in a table. Then, increase nu and nv and report the forces for each mesh size. You should see the forces converging to a given value. You can pick nu and nv values as soon as the forces have converged, and it will not be necessary to have a more refined mesh as it will take more computational time.
Computational time of each block can be reported in the command line using the ‘printSlowestBlocks’:
Or, for more details, please refer to the “Blocks Execution Timing” HTML viewer (CTRL + T).