Learning Forum

[Loic Ivaldi]

Hello based on what you said, I'm almost sure that is a mass scaling problem.

 

Regarding the matsum in workbench, I'm not used with it but I think by default it should write the output. Try in the solution tab if you find something like "added mass".

 

If you have LS-PrePost installed I could show you.

 

For your tool penetrating the SPH Part it's related to the mass scaling. With SOFT=1 the contact stiffness penalty is computed by taking account the timestep. In your case the penalty is too "soft" allowing a big penetration.

 

Could you give me the time step without mass scaling ? 

 

If you open the directory where your simulation takes place, you should have many mesXXXX files. Open with a text editor mes0000 and at the end of the file you should have a line like that :

 

       1 t 0.0000E+00 dt 2.77E-07 flush i/o buffers            08/17/23 20:21:13

       1 t 0.0000E+00 dt 2.77E-07 write d3plot file            08/17/23 20:21:13

 

Here "2.77E-07" is the initial timestep.

 

Also for info, the 1st column and the 3rd column are respectively the number of cycle and the time of your simulation. For example if I have the following lines :

 

       1 t 0.0000E+00 dt 2.77E-07 flush i/o buffers            08/17/23 20:21:13

       1 t 0.0000E+00 dt 2.77E-07 write d3plot file            08/17/23 20:21:13

    5000 t 1.3848E-03 dt 2.77E-07 flush i/o buffers            08/17/23 20:31:20

 

The 3rd lines means 5000 timestep were made and if I do 5000 * 2.77e-7 = 1.3848E-03. Here I'm in second so in 5000 timestep I have done 1.3848E-03 s of my simulation.

 

Best Regards,

Loïc