Dear Siddarth,

OK that sounds pretty similar to Bastien’s approach. We will hopefully get hold of that copy for you soon.

The main reason the user guide stated 2D and quasi 3D is because that is what we initially set up the code to handle. We have however extended the Arnoldi methods we are using to parallel and implemented the 3D linearised terms. So it mainly needs further validation to see how it is working.

Cheers,
Spencer.

On 18 Jan 2016, at 09:47, Siddarth Chintamani <siddarth.ch1990@gmail.com> wrote:

Dear Spencer,

We have obtained steady state solutions using the SFD technique with multiple filters and used it as baseflow in the past. We have done it using an adaptive finite volume code and used multiple filters to filter out the unstable high frequency shear modes and low frequency modes. I am just starting to use finite element methods but I think the same techniques should work. 

I wanted to make sure that the direct and adjoint evolution operators in nektar can handle the relatively large meshes in 3D flows. And the user guide mentions that the stability analysis is limited to 2D or quasi 3D (I am wondering why?).

It would be great if I could get hold of Bastiens thesis.

Thank you very much.

Regards,
Siddarth Chintamani

On Jan 17, 2016, at 2:57 PM, Sherwin, Spencer J <s.sherwin@imperial.ac.uk> wrote:

Dear Siddarth,

We have been exploring this option, most recently in the work of Bastien Jordi under his thesis work. I am trying to get hold of a digital copy or Bastien can send you one.

One  of the challenges of doing fully 3D stability analysis is how to get hold of an appropriate base flow. Do you have a way to do this? Otherwise I think the tools are generally working although we are continuing to validate them.

Regards,
Spencer.

On 16 Jan 2016, at 22:24, Siddarth Chintamani <siddarth.ch1990@gmail.com> wrote:

Hello,

I am trying to perform stability analysis of linearized incompressible Navier Stokes equation of a three-dimensional baseflow. I understand that Nektar++ capabilities for stability analysis are limited to 2D or Quasi3D baseflow representation. Unfortunately, my problem has to be solved as 3D. Is there any way to relax the 2D or quasi3D representation? 

Any help will be greatly appreciated.

Thank you,
Siddarth Chintamani
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Spencer  Sherwin
McLaren Racing/Royal Academy of Engineering Research Chair, 
Professor of Computational Fluid Mechanics,
Department of Aeronautics,
Imperial College London
South Kensington Campus
London SW7 2AZ

+44 (0) 20 759 45052


Spencer  Sherwin
McLaren Racing/Royal Academy of Engineering Research Chair, 
Professor of Computational Fluid Mechanics,
Department of Aeronautics,
Imperial College London
South Kensington Campus
London SW7 2AZ

+44 (0) 20 759 45052