Main Help → All Commands → MPM Analysis Header → Damping
The Damping
command adds external damping based on grid velocity extrapolated to the particle during MPM calculations:
Damping (alphaVsT)
where
(alphaVsT)
is a grid damping coefficient (in 1/time units). The default is 0 or no damping. The provided (alphaVsT)
can be a user-defined function of time that evaluates to the grid damping coefficient and allows a simulation to change the amount of damping as the simulation proceeds.You can refer to the OSUPDocs wiki for information on damping options, along with advice on selecting the right amount of damping. The process is often trial and error, but some guidelines based on wave speed of the material are given.
Damping
command is only allowed for MPM analyses.