[thunde47]

substrateVelocity1
        {

			type 			vectorSemiImplicitSource;
			//timeStart       0;
			//duration        0.04;
			//active			on;
			volumeMode 		absolute;
			selectionMode   cellZone;    //cellZone or all
			cellZone        substrate;
			
			injectionRateSuSp
			{      
				U
				{
					
					Su  table 
					(
						(0 (808.4 0 0))
						(0.01 (808.4 0 0))
						
						//(0.01001 (-808.4 808.4 0))
						//(0.01002 (0 808.4 0))
						(0.02 (0 808.4 0))
						
						(0.02001 (-808.4 0 0))
						(0.03 (-808.4 0 0))
						
						(0.03001 (0 -808.4 0))
						(0.04 (0 -808.4 0))
					);
					Sp  0;
				
				}
			}
        }

1. I think this injectionRateSuSp is simply not applying the velocity. It is applying acceleration to the NS. Is that correct? I notice the velocity keeps increasing steadily in the results.
2. OpenFOAM takes U/rho in NS, therefore I have provided U*rho in fvOptions. Is that correct?
3. What is the best way of applying time-varying velocity to a cell zone in OpenFOAM?