https://ecomodder.com/forum/member-a...ion-plates.jpghere's the original box-cavity, by Continuum Dynamics, financed with a Defense Advanced Research Projects Agency (DARPA ) / Small Business Administration' ( SBA ) innovation and research grant.
You may notice how 'shallow' the vortices are, captured along the spans of the four longitudinal panels.
This mimicks the onset of roof curvature transition 'roof-bending', as seen in W. A. Mair's torpedo boat-tailing. NASA's Project Shoebox. Walter Korff's 1963, Cd 0.20 semi-trailer. R.B. Potter's March 6, 1956 US Patent# 2,737,411. Union-Pacific Railroad's aerodynamic tail-car of 944. Airship Hindenburg. Koenig-Kamm half-bodies of the mid-1930s. Walter Lay's low drag models of 1933. Airship ' City of Glendale, by Thomas Benton Slate, 1929. Paul Jaray's 'pumpkin seed of 1922. Samuel L. Calthrop's 'Air Resisting Train' tail-car of 1965.
--------------------------------------------------------------------------------------
Introducing a more radical change in initial cross-section violates adverse pressure gradient boundary-layer rules emphasized by by Wolf Heinrich Hucho, and his mentor, Dr. Hermann Schlicting, who literally wrote the book ' Boundary-Layer Theory.'
