Thanks for the reply. I already did some troubleshooting actually and the method produces reasonable results. I was just curious if anyone else has gone this route. My test cases included shearing a periodic domain with water (phase lag between stress and strain for this case should be ~90 degrees). I also measured the viscosity and it gives the same values as the viscosity I got using different methods (Hagen-Poiseuille flow and Couette flow). Interestingly, if I use just fix deform without sllod then I did not get as good of an agreement for the phase lag, but that may just be from the particular setup I was using. For fix deform I do remap the velocities, I forgot to mention that earlier.