[WIP] Implementation of DDES and SAS formulations for SST

[rois1995]

Proposed Changes

Hi everyone,

I have been working on the implementation of the DDES formulations for the SST model, following the work in "Development of DDES and IDDES Formulations for the k-ω Shear Stress Transport Model" (DOI:10.1007/s10494-011-9378-4). The implementation is easy, whereas the validation may take some time. I am currently working on the backward facing step and I will work on the flatplate too. The choice of the validation test cases is key since the computational cost is quite large, thus if you have any suggestions that may speed up this part then feel free to write them down.

Implemented versions:

• SST-DDES
• SST-IDDES
• SST-SIDDES

I am also working on the Scale Adaptive Simulations (SAS) implementations for SST, following the work in "ON URANS SOLUTIONS WITH LES-LIKE BEHAVIOUR", Travis et al., and "[Evaluation of scale-adaptive simulation for transonic cavity flows", Babu et al., (https://www.inderscienceonline.com/doi/abs/10.1504/IJESMS.2016.075510). The last one, especially, is quite tricky due to the computation of the velocity laplacian. I tried computing it in Paraview as the divergence of the gradient field and it seems quite similar, but it is the first time that I've touched that section of the code, thus some work might still be needed.

Implemented versions:

• SST-SAS_Simple (better naming is necessary), from the article of Travis et al.
• SST-SAS_Complicated (better naming is necessary), it is related to the article from Babu et al.

PR Checklist

Put an X by all that apply. You can fill this out after submitting the PR. If you have any questions, don't hesitate to ask! We want to help. These are a guide for you to know what the reviewers will be looking for in your contribution.

• [X] I am submitting my contribution to the develop branch.
• [ ] My contribution generates no new compiler warnings (try with --warnlevel=3 when using meson).
• [X] My contribution is commented and consistent with SU2 style (https://su2code.github.io/docs_v7/Style-Guide/).
• [ ] I used the pre-commit hook to prevent dirty commits and used pre-commit run --all to format old commits.
• [ ] I have added a test case that demonstrates my contribution, if necessary.
• [ ] I have updated appropriate documentation (Tutorials, Docs Page, config_template.cpp), if necessary.

[bigfooted]

Hi @rois1995 any progress? Would be very interesting to add this to develop, looking forward to using it actually.

[rois1995]

Hi @rois1995 any progress? Would be very interesting to add this to develop, looking forward to using it actually.

Hi @bigfooted, unfortunately I do not have enough time/computational power to perform a proper validation. I only tried something with a NACA0021 at 17 deg and 60 deg and they were promising, at least for the DDES implementation. The SAS ones are not that good. I'll upload some post-processing as soon as I have the time to do so.

[Linnnnnn23]

I find your work really interesting. I've been studying the internal flow field in compressors and have had good results using SU2's SA_EDDES for calculating the cantilevered stator with a tip clearance. If you need help with code verification, I'd be glad to assist.

[rois1995]

I find your work really interesting. I've been studying the internal flow field in compressors and have had good results using SU2's SA_EDDES for calculating the cantilevered stator with a tip clearance. If you need help with code verification, I'd be glad to assist.

Hi @Linnnnnn23, every help on the validation/verification is gladly accepted! Let me know if you need anything by my side.

[Linnnnnn23]

I find your work really interesting. I've been studying the internal flow field in compressors and have had good results using SU2's SA_EDDES for calculating the cantilevered stator with a tip clearance. If you need help with code verification, I'd be glad to assist.

Hi @Linnnnnn23, every help on the validation/verification is gladly accepted! Let me know if you need anything by my side. Thank you for your response. Firstly, I would like to know what Verification and Validation (V&V) work has been conducted on the SST-based DDES (Delayed Detached Eddy Simulation) model to date. Secondly, we can provide a compressor cascade validation, with an inlet Mach number of 0.4, a Reynolds number of approximately 500,000, and a spanwise height of about 20% of the chord length, ensuring that the vortices resolved by DDES can develop in three dimensions. Thirdly, as I am a rookie to GitHub, I have not yet found out how to download your pull request code. For further communication, you can contact me via email at [email protected]