Stabilization methods

Hello,

How does using stabilization methods like streamline diffusion, cross wind or isotropic diffusion affect my solution.To elaborate, I am solving navier stokes and convection diffusion problem in a tme dependent study and compare the outlet concentration with time with the actual experimental curve. At high velocity, the solution does not converges, so I am adding streamline diffusion to the covection diffusion physics. How is this going to be different with actual results if I had not used this stabilization. I have tested it subsequently adding streamline, then crosswind and then isotropic diffusion. In all the cases, the solution varies. So, that puts me in a real fix if the solution I obtain using stabilization method should be comparable with real situation ?

Thanks
Pranay