Watch your adjoints! Lack of mesh convergence in inviscid adjoint solutions

Lozano, Carlos

Publicación:
Watch your adjoints! Lack of mesh convergence in inviscid adjoint solutions

dc.contributor.author	Lozano, Carlos	es
dc.contributor.funder	Instituto Nacional de Técnica Aeroespacial (INTA)	es
dc.date.accessioned	2023-12-04T09:36:53Z
dc.date.available	2023-12-04T09:36:53Z
dc.date.issued	2019-08-05
dc.description	Copyright © 2019 by Carlos Lozano. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. All requests for copying and permission to reprint should be submitted to CCC at www.copyright.com; employ the eISSN 1533-385X to initiate your request. See also AIAA Rights and Permissions www.aiaa.org/randp.	es
dc.description.abstract	It has been long known that 2D and 3D inviscid adjoint solutions are generically singular at sharp trailing edges. In this paper, a concurrent effect is described by which wall boundary values of 2D and 3D inviscid continuous and discrete adjoint solutions based on lift and drag are strongly mesh dependent and do not converge as the mesh is refined. Various numerical tests are performed to characterize the problem. Lift-based adjoint solutions are found to be affected for any flow condition, whereas drag-based adjoint solutions are affected for transonic lifting flows. A (laminar) viscous case is examined as well, but no comparable behavior is found, which suggests that the issue is exclusive to inviscid flows. It is argued that this behavior is caused by the trailing edge adjoint singularity.	es
dc.description.peerreviewed	Peerreview	es
dc.description.sponsorship	The research described in this paper has been supported by INTA and the Ministry of Defence under the grant Termofluidodinámica (IGB99001). The author would like to thank J. Ponsin and D. Ekelschot for discussions. The computations reported in the paper were carried out with the TAU Code, developed at DLR’s Institute of Aerodynamics and Flow Technology at Göttingen and Braunschweig, which is licensed to INTA through a research and development cooperation agreement. Cross-checking has been also performed with the SU2 code, an open source code developed at the Aerospace Department of Stanford University.	es
dc.identifier.citation	AIAA Journal 57(9): (2019)	es
dc.identifier.doi	10.2514/1.J057259
dc.identifier.e-issn	1533-385X
dc.identifier.other	https://arc.aiaa.org/doi/10.2514/1.J057259	es
dc.identifier.uri	http://hdl.handle.net/20.500.12666/907
dc.language.iso	eng	es
dc.publisher	Aerospace Research Central	es
dc.rights.accessRights	info:eu-repo/semantics/restrictedAccess	es
dc.rights.license	Copyright © 2019 by Carlos Lozano	es
dc.subject	Trailing edges	es
dc.subject	Flow conditions	es
dc.subject	Airfoil profiles	es
dc.subject	Angle of attack	es
dc.subject	Pressure coefficient	es
dc.subject	Aerodynamic design	es
dc.subject	Euler equations	es
dc.subject	Viscosity	es
dc.subject	Stagnation streamlines	es
dc.subject	Vortex shedding	es
dc.title	Watch your adjoints! Lack of mesh convergence in inviscid adjoint solutions	es
dc.type	info:eu-repo/semantics/article	es
dc.type.coar	http://purl.org/coar/resource_type/c_6501	es
dc.type.hasVersion	info:eu-repo/semantics/acceptedVersion	es
dspace.entity.type	Publication

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