Improving Load Balance in MPP-LSDYNA for ALE and SPH

In an earlier post on decomposition and region domains we saw how customized PFILE can be used to improve load balancing. Two new commands “aledist” and “sphdist” can now be included in “PFILE” that allows LS-DYNA to distribute the ALE and SPH information across all processors. This will greatly improve the load balancing when using increased number of processors. The default and modified decomposition is shown below.

ALE Model

Default Decomposition

Distributed Decomposition

Thanks to Dr. Jason Wang of LSTC for clarifying on some of the implementation of this feature.

It must be noted that the coupling interface between ALE and the lagrangian elements are not affected by the presence of ‘aledist’

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