Unstructured Viscous Time Step Estimate

Anthony Iannetti

If any body could help,

I am looking for an unstructured viscous, or Von Neumann, time step estimate. I have come across a few papers that address this for structured grids based on eignvalue analysis. Swanson, NASA TP 1336 is one such paper. I have done an extensive literature search, and I have found nothing when it comes to unstructured grids. Everybody uses on a inviscid, or CFL based time step estimate. Most of the analyses where done on 1D or 2D systems. It is a lot of work to translate their analysis into unstructured termonolgy. (In fact, I am better of rederiving everything.) If anybody could help, or would like to collaborate, I would appreciate it.

Thanks, Tony