Alternative drag calculations from off body flow quantities using the FLOWer code

A technique for the evaluation of the thermodynamic drag from flow field solutions based on Oswatitsch’s theorem is discussed. The technique allows the decomposition of thermodynamic drag into wave drag and viscous drag. Consequently, it provides more physical insight into the drag sources than conventional surface force integration techniques. The method is applied to two-dimensional flow field solutions obtained from the FLOWer code. Qualitative comparisons of the two techniques are presented for a NACA 0012 airfoil at different Mach numbers.