Mach number validation of a new zonal CFD method (ZAP2D) for airfoil simulationsA closed-loop overlapped velocity coupling procedure has been utilized to combine a two-dimensional potential-flow panel code and a Navier-Stokes code. The fully coupled two-zone code (ZAP2D) has been used to compute the flow past a NACA 0012 airfoil at Mach numbers ranging from 0.3 to 0.84 near the two-dimensional airfoil C(lmax) point for a Reynolds number of 3 million. For these cases, the grid domain size can be reduced to 3 chord lengths with less than 3-percent loss in accuracy for freestream Mach numbers through 0.8. Earlier validation work with ZAP2D has demonstrated a reduction in the required Navier-Stokes computation time by a factor of 4 for subsonic Mach numbers. For this more challenging condition of high lift and Mach number, the saving in CPU time is reduced to a factor of 2.
Document ID
19910034546
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Strash, Daniel J. (Analytical Methods, Inc. Redmond, WA, United States)
Summa, Michael (Analytical Methods, Inc. Redmond, WA, United States)
Yoo, Sungyul (Analytical Methods, Inc. Redmond, WA, United States)