Adjoint solution

robyTKD · February 4, 2013, 12:27

Hello,

I am analyzing adjoint solution around NACA0012. In adjoint.vtk file I see 3 different fields: PsiRho, PsiE and Phi. Can anybody tell me if they have a physical interpretation? In particular, I am not sure how to interpret them in the flow region.

Another doubt is about sensitivity in the surface_adjoint.csv: is it Cd = Cd_old + S * \deltan
where S is the sensitivity and \deltan is the displacement[meter] in the normal to airfoil direction?

Last question: is it possible to perform a fully turbulent(no FROZEN viscosity) adjoint simulation with SA turbulent model?

Thank you very much,
Roberto

fpalacios · February 5, 2013, 00:41

Hi Roberto,
I think this article http://www.stanford.edu/~fasispg/art..._March2012.pdf could be useful for you. In fact there is a non-frozen viscosity implementation that we are validating (our team have some articles this summer where the viscous adjoint is a key element).

Cheers,
Francisco

February 4, 2013, 12:27	Adjoint solution	#1
robyTKD Member Roberto Pieri Join Date: Feb 2012 Location: Milan Posts: 57 Rep Power: 14	Hello, I am analyzing adjoint solution around NACA0012. In adjoint.vtk file I see 3 different fields: PsiRho, PsiE and Phi. Can anybody tell me if they have a physical interpretation? In particular, I am not sure how to interpret them in the flow region. Another doubt is about sensitivity in the surface_adjoint.csv: is it Cd = Cd_old + S * \deltan where S is the sensitivity and \deltan is the displacement[meter] in the normal to airfoil direction? Last question: is it possible to perform a fully turbulent(no FROZEN viscosity) adjoint simulation with SA turbulent model? Thank you very much, Roberto

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February 5, 2013, 00:41		#2
fpalacios Super Moderator Francisco Palacios Join Date: Jan 2013 Location: Long Beach, CA Posts: 404 Rep Power: 15	Hi Roberto, I think this article http://www.stanford.edu/~fasispg/art..._March2012.pdf could be useful for you. In fact there is a non-frozen viscosity implementation that we are validating (our team have some articles this summer where the viscous adjoint is a key element). Cheers, Francisco