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Originally Posted by Grant-53
Do you mean the late Prof. Walter E. Lay from Univ. of Michigan? Could you give the title and date of the study? Thanks.
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Yes,same man.Lay published in 1933.Kamm picked up on his work in 1935.Hucho shows an abbreviated tabulation of Lay's results.The whole thing is in Aerodynamiks des Kraftfahrtzeugs, by Fachsenfeld,1951.
Lay demonstrated that it required a very nasty cowl/windshield ( the HUMMER H-1 would qualify) to trash the airflow over the windshield header.
There will be a small burble of air at the base of the windshield for fresh air ventilation.The outer flow field skips mover this entire area with what Ludwig Prandtl termed, a 'line of discontinuity',avoiding sharp turns over the top and around the A-pillars.You can see this in most wind tunnel smoke flow photos.