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SPH formulation - box deformation

Altair Forum User

Hello Everybody,

I'm trying to use SPH Method with Radioss.

I would like to determinate the deformation of a box full of water. I've modeled SPH Particles of water as simple cubic and I've used interface type 7 between water and box. Loads: lock of the base of box and gravity load to water particles. The simulation run without error but results are different than expected: pressure is not uniformly distributed becuase particles don't mantain the initial pitch.

What is the error?

In attach the .hm file.

Could someone help me, please?

Thanks in advance.

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Altair Forum User

Hi Marta,

I ran your model. This is the expected behavior of the model for this loading condition. Since you are loading the created SPH particles, it will fall down to the bottom of the box and the pitch will not be maintained. I have attached the h3d file of the run.

Are you looking for a continuous flow of SPH particles?. Please see the attached gif file showing the continuous flow of SPH particles, where the pitch of particles in maintained.

<?xml version="1.0" encoding="UTF-8"?>

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Altair Forum User

Hi George,

I'm very thankful for your replay!

No, I'm actually not looking for a continuos flow; I used the SPH method for meshing water, because I want to see the deformation of a box full of liquid.

I think an alternative solution could be to apply a variable pressure inside the box, increasing with depth and applied to different contact surface (see the fig. attach), but I'd like to try the SPC method, if it is possible.

So I need that the particles mantain their pitch and employ pressure on box's wall.

Any suggestion?

Thanks a lot

image.png.8ca4b26e732b16dff9ef99d7b953b3e6.png

Altair Forum User

Hi Marta,

As an alternate approach, can you try filling the box with SPH particles and drop the container to a rigid wall so that you will get the pressure exerted by the particles on the wall.

Altair Forum User

Hi George,

thank you very much for your suggestion.

A last question: how can I see the particles not like point but big, like in your gif?

Thanks

Altair Forum User

Hi Marta,

In HyperView, go to Preferences, select Options and select Visualization. Select Mass from the menu and keep it to DOT.

Using the Size of mark option you can increase/decrease the particle size.

<?xml version="1.0" encoding="UTF-8"?>