Studies and vorticity effects by the Euler equations with emphasis on supersonic flow fields
Abstract
The primary purpose of the present report is to demonstrate how well the Euler equations in a supersonic marching program (SWINT) can predict the flow fields of bodies, wings, and wingbody combinations. The motivation was to see if if the Euler equations will predict the fin loads in highly vortical flow fields for cruciform missiles. Bodyalone and wingbody flow fields were measured in the Bumblebee Program at a position where a tail might be placed. Those data, compared with the predictions of the Euler code, showed problems in both data and predictions. The data sometimes exhibited lack of repeatability which prevented critical comparison of data and theory in many instances. Also the lack of a sufficient number of nodes in the reverse flow regions of the flow made it difficult to get good predictions in this area. Some improvements were obtained by clustering. Computer studies of the flow field behind the wing showed that wing thickness effects had only a small effect on the calculated flow field. Also, imposition of a Kutta condition at the wing side edge had a small effect on the calculated flow field.
 Publication:

Final Report Nielsen Engineering and Research
 Pub Date:
 October 1983
 Bibcode:
 1983neri.rept.....N
 Keywords:

 Aerodynamic Loads;
 BodyWing Configurations;
 Computational Fluid Dynamics;
 Euler Equations Of Motion;
 Missile Configurations;
 Prediction Analysis Techniques;
 Supersonic Flow;
 Computer Programs;
 Differential Equations;
 Fins;
 Flow Distribution;
 KuttaJoukowski Condition;
 Panel Method (Fluid Dynamics);
 Reversed Flow;
 Vortices;
 Wakes;
 Fluid Mechanics and Heat Transfer