Hello sidefx
In houdini 11's pyro sim,project non-divergent step waste too much memory,
iiiiiiiis it store a full A matrix?? :shock: I hope this can be improved in 12!
and can we have a more parallelized method (like multigrid) for a preconditioner in 12? (or we will use other projection method?)

Don't know.
Yes.
Yes.

liuxiaolin
is it store a full A matrix?

Sparse matrices and sparse volumes are used. However, depending on task at hand, the level of sparsity in the internal data structures will vary.

Pretty good, thanks for your answer.