Reno Genest
Ansys Employee

 

 

Hello Mustapha,

What do you mean by shockwave? Are you modeling a blast from some sort of explosive? If so, one way to model a blast load (pressure) on a structure without explicitly modeling the explosive and the air is to use the keyword *LOAD_BLAST_ENHANCED to apply a pressure load directly on the structure. You will have to define the equivalent mass of TNT with the “M” parameter for this keyword. You will find more information here:

https://ftp.lstc.com/anonymous/outgoing/support/PRESENTATIONS/blast_slavik_ucsd.pdf

https://www.dynalook.com/conferences/european-conf-2009/J-I-03.pdf/view

You will find more papers by searching on dynalook.com

 

If you know the pressure vs time profile for each element of the structure or if you can assume a constant pressure vs time profile for a group of elements, you can apply the blast load pressure using one of the following keywords:

*LOAD_SEGMENT

*LOAD_SEGMENT_SET

You can define the pressure vs time profile using LCID and *DEFINE_CURVE. See the LS-DYNA user manual vol I for more information:

https://lsdyna.ansys.com/manuals/

 

Let me know how it goes.

 

Reno.