Hi Xiangjun, According to Giannetti and Luchini JFM 2007, sensitivity is the dyadic product of direct and adjoint modes. I have reproduced Giannetti and Luchini's result for Re = 50 (attached in this email) using Nektar++. To do this multiplication, I first rename the variables of direct and adjoints modes obtained from the stability analysis. Then put them into a single file using FieldConvert. Now, rest calculations can be done inside ParaView or Visit. With regards --------------------------------------------------------------------------------------- Abhishek Kumar Assistant Professor (Research) Centre for Fluid and Complex Systems Coventry University, Coventry CV15FB The United Kingdom Web: https://sites.google.com/view/abhishekkir --------------------------------------------------------------------------------------- [image: visit0006.png] On Wed, Oct 27, 2021 at 10:17 PM Sherwin, Spencer J < s.sherwin@imperial.ac.uk> wrote:
Dear Xiangjun,
I believe the sensitivity plots are related to the inner product of the adjoint and forward modes. I am afraid I do not recall which inner products gives you which sensitivities.
Cheers, Spencer.
On 27 Oct 2021, at 08:31, shan xiangjun <x_j_shan@outlook.com> wrote:
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Dear all:
I want to use the Nektar++ to conduct structural sensitivity analysis on the flow problem. I can get direct and adjoint modes, but I don't know how to get the sensitivity of base flow modification and local feedback (as shown in figure).
Can anyone help me?
Looking forward to your reply!
Best regards,
Xiangjun Shan
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