water entry

Hi,

Yes, you can perform such simulation. :-)

Overset is not mandatory because the entire domain could follow the missile (like in Tutorial 3 Advanced), but it is much better to use it to preserve the free surface clean in the far field since the missile is rotating as well.

We have already done it a couple of times, but I am not aware of any public validation case from our customers. In the past, we just created a dummy case to illustrate the project for a torpedo ejection from a submarine. You can find it attached. In this project, the missile is leaving water to the air, so it is the opposite of what you are willing to do but the numerical setup is exactly the same.

Best regards,

Benoit2_domains_backup_24-06-2022_17h-40m-06s.zip

Thank you for the case setup :-)

can we do this in a single simulation, & for 3d case the setup is same ?

you're welcome :-)

Yes, your test can be done in 1 single computation and 3d setup is the same as 2d, no problem.

Best regards,

Then if my case is 3d the motion should be specified in Rz?

i.e., velocity in negative direction is this correct?

It can be any rotation in 3D. But remember that gravity will be involved and is given in Z direction.
So if you import or solve a rotation while entering the water, I guess it will be around Ry.

Positive or negative will depend on the orientation of your geometry in the setup. But if you do the exact same as on the picture you provided, I guess yes, it should be negative since it rotates from X to Z.