[hashem9714]

hello

I want to study super cavitation for a cylindrical body that moves in water at a constant speed. Cavitation does not occur at a speed of 5 meters per second, so I am going to create artificially. What should I do to do this?

[profi_star-ccm+]

Originally Posted by hashem9714

hello

I want to study super cavitation for a cylindrical body that moves in water at a constant speed. Cavitation does not occur at a speed of 5 meters per second, so I am going to create artificially. What should I do to do this?

Change the speed> 10 m / s, change the density of the water in the model, and so on - (multiphase interaction).

I took part in the development of the Shkval torpedo in the USSR. Unfortunately, the secrets of supercavitation at low speeds are classified and in Star-ssm + you cannot solve. We also use this effect in underwater pistols. The answers to these questions cost over $ 1,000 000.

[hashem9714]

Originally Posted by profi_star-ccm+

Change the speed> 10 m / s, change the density of the water in the model, and so on - (multiphase interaction).

I took part in the development of the Shkval torpedo in the USSR. Unfortunately, the secrets of supercavitation at low speeds are classified and in Star-ssm + you cannot solve. We also use this effect in underwater pistols. The answers to these questions cost over $ 1,000 000.

hello thank you for answer but a more question
for the same shkval how define Boundary conditions ?

can you help more ?

[profi_star-ccm+]

Originally Posted by hashem9714

for the same shkval ?

I never use body parts as well as symmetrical body parts. In my calculations, there is no boundary condition - symmetry. Therefore, the boundary conditions are set incorrectly. This allows you to expand the possibilities of manipulating the names of boundary conditions and get a more natural accompaniment of the calculation during visualization. That is, I can go there, but I can also here, as in nature, and not as an engineer wants, moving a body among a group of bodies, guiding. Freedom is my main thesis - a slogan, almost tolerant Democracy, as elsewhere - outside my borders. To ensure such a democracy, a powerful tool of labor and order is needed. I control such a computer.
You can use a whole set of boundary condition options for your application. The simplest, for initial training, requires input to generate current, output to generate output from the calculated field and sidewalls. The body will be the wall. Try to create some volume around your body.

I am doing wrong. I use the movement of the body itself, and the boundaries have different names or the same, but in larger volumes. Great opportunities open up before the artist-creator. This is an art, not a democratic calculation of an engineer. To create or calculate the Flurry, you need to have more than just talented engineers, you need at least one genius and a supercomputer or at least a single-processor system with 32-64 cores. Then the world will seem different and the enemy will not be terrible.
Ask questions only in the mail, so that I do not annoy the tolerant community.
Note:
Use mesh cylinder refinement in the region.
Use a fine mesh.
If you want to reach or get closer to the vertex, do not use automatic meshing. Manual only.