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Title: Entropy and adjoint methods
Authors: Lozano, Carlos
Keywords: Adjoint;Oswatitsch drag formula;Entropy variables;Error estimation
Issue Date: 11-Nov-2019
Publisher: Springer Link
DOI: 10.1007/s10915-019-01092-0
Published version:
Citation: Journal of Scientific Computing 81: 2447–2483(2019)
Abstract: Aerodynamic drag can be partially approximated by the entropy flux across fluid domain boundaries with a formula due to Oswatitsch. In this paper, we build the adjoint solution that corresponds to this representation of the drag and investigate its relation to the entropy variables, which are linked to the integrated residual of the entropy transport equation. For inviscid isentropic flows, the resulting adjoint variables are identical to the entropy variables, an observation originally due to Fidkowski and Roe, while for non-isentropic flows there is a significant difference that is explicitly demonstrated with analytic solutions in the shocked quasi-1D case. Both approaches are also investigated for viscous and inviscid flows in two and three dimensions, where the adjoint equations and boundary conditions are derived. The application of both approaches to mesh adaptation is investigated, with especial emphasis on inviscid flows with shocks.
Description: Lozano, C. Entropy and Adjoint Methods. J Sci Comput 81, 2447–2483 (2019).
E-ISSN: 1573-7691
ISSN: 0885-7474
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