2169     IS              isx, isv, istmp;  in SetProblem()  local
2184     PetscCall(ISCreateBlock(PETSC_COMM_WORLD, dim, Np, idx, PETSC_COPY_VALUES, &isv));  in SetProblem()
2188     PetscCall(TSRHSSplitSetIS(ts, "momentum", isv));  in SetProblem()
2190     PetscCall(ISDestroy(&isv));  in SetProblem()
2267   IS       isx, isv;  in InitializeSolveAndSwarm()  local
2290   PetscCall(TSRHSSplitGetIS(ts, "momentum", &isv));  in InitializeSolveAndSwarm()
2294   PetscCall(VecISCopy(u, isv, SCATTER_FORWARD, gv));  in InitializeSolveAndSwarm()
2320     IS         isx, isv;  in MigrateParticles()  local
2325     PetscCall(TSRHSSplitGetIS(ts, "momentum", &isv));  in MigrateParticles()
2327     PetscCall(VecGetSubVector(u, isv, &momentum));  in MigrateParticles()
2333     PetscCall(VecISCopy(u, isv, SCATTER_REVERSE, gv));  in MigrateParticles()
2365     PetscCall(VecRestoreSubVector(u, isv, &momentum));  in MigrateParticles()