Thanks for your reply.nSo, I'll need to save these files manually after every few timesteps, right? This can be done but it is not efficient.nDo you have any reference to UDF, which can be helpful creating udf?nI especially want to know how to access each element in domain. In eulerian simulation we go from x[ND_ND] then x[1] to obtain 'y' position of the each cell, then loop over cell in all threads. How should I loop over all particles?nAppreciate your support, thanks.n