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Direct differentiation method - negative gradient |
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February 28, 2018, 10:06 |
Direct differentiation method - negative gradient
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Evgeniy
Join Date: Oct 2017
Posts: 5
Rep Power: 9 |
Dear su2 people,
i'm doing verification analysis of AD discrete adjoint method on 3D two element wing model with FFD box. When i calculated objective function gradient by using forward direct differentiation method i found that it agrees with adjoint gradient (of Lift and Drag) only if i multiply it by -1 (see attachment). Maybe it's relevant that in my model Y axis is aligned with Lift force direction, X - with drag and Z - with side force. Is this just coincidence of wrong results or direct differentiation method calculates negative gradient? Thanks, Evgeniy |
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