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The details of the Zero Pressure Gradient Flat Plate case are taken from the [NASA TMR website](https://turbmodels.larc.nasa.gov/flatplate.html).
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By comparing the SU2 results of the flat plate case against CFL3D and FUN3D on a sequence of refined grids and seeing agreement of key quantities, we can build a high degree of confidence that the SA and SST models are implemented correctly. Therefore, the goal of this case is to verify the implementations of the SA and SST models in SU2.
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This page contains the results of running MMS for the compressible Navier-Stokes system in order to formally verify the order-of-accuracy for the 2nd-order finite volume solver in SU2. These cases were completed with SU2 v7.0.0.
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For more details, please see the presentation on the subject from the [4th Annual SU2 Developers Meeting](https://su2foundation.org/wp-content/uploads/2019/05/SU2_Verification_EdwinTom.pdf).
The script will automatically generate the required meshes and execute SU2 solutions for the four different cases on those meshes for comparison. Four config files are provided, but you can modify them or add new ones. Simply change the config files listed at the top of the compute_order_of_accuracy.py script. Postprocessing is also automatically performed by the script, including the creation of figures for global error vs relative grid size and observed order of accuracy vs relative grid size.
Do you want to contribute to SU2 with a V&V case study? It's easy! Just create a fork of the [SU2 Project Website repository](https://github.com/su2code/su2code.github.io), write your case study and open a pull request.
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## Writing content
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The case studies in this section of the site are stored under the `_vandv` folder. To add your contributions:
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**1.** Add a new Markdown file inside the subfolder, as `_vandv/Your_Case_Name.md`. Add the following [front matter](https://jekyllrb.com/docs/frontmatter/) to your file:
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```
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---
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title: Your Case Study Title
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permalink: /docs/Your_Case_Name
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---
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I'm contributing to SU2!
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```
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**2.** Create a new subfolder in `_vandv_files/` as `_vand/Your_Case_Name`, where you can store any additional files needed for your case study, such as config file, mesh, and images of results. Don't forget to provide the relative links in your Markdown file to these auxiliary files, if necessary.
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**3.** Add the case study pagename to the `_data/vandv.yml` file, in order to list it in the navigation panel:
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```
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- title: Your Subgroup of Case Studies
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vandv:
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- Your_Case Name
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```
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**4.** When you are ready, submit a pull request to the **develop** branch of the [SU2 Project Website repository](https://github.com/su2code/su2code.github.io)... and it's all done! Thanks for your contribution!
Copy file name to clipboardExpand all lines: _vandv/index.md
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redirect_from: /vandv/index.html
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---
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The cases presented in this section demonstrate the verification and validation (V&V) of the solvers within the SU2 suite. Verification activities assess whether a particular model has been implemented correctly in software, i.e., it is coded as specified and bug-free. Validation activities assess whether a particular model matches the physical reality for a situation of interest, typically via comparison with experiment.
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The case studies presented in this section demonstrate the verification and validation (V&V) of the solvers within the SU2 suite. Verification activities assess whether a particular model has been implemented correctly in software, i.e., it is coded as specified and bug-free. Validation activities assess whether a particular model matches the physical reality for a situation of interest, typically via comparison with experiment.
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When available, rigorous verification via formal order of accuracy assessment by exact or manufactured solutions is performed. When exact or manufactured solutions are not available, code-to-code comparisons are made. By comparing SU2 results against many well-established codes on a sequence of refined grids and seeing agreement of key quantities in the limit, we can build a high degree of confidence that the models found within SU2 are implemented correctly.
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We will continue to add cases over time to demonstrate V&V of additional physical models in SU2, and we encourage contributions from the community!
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We will continue to add cases over time to demonstrate V&V of additional physical models in SU2, and we encourage contributions from the community! Please see the contribute page for instructions on how to contribute.
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**NOTE**: The primary purpose of this section of the website is to demonstrate V&V of the SU2 suite, and as such, the case studies are not written as tutorials. However, you can typically find the files needed to run the cases yourself in the [project V&V repository](https://github.com/su2code/vandv).
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## Summary of V&V case studies
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------
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#### Compressible Flow
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*[Method of Manufactured Solutions for Compressible Navier-Stokes](/vandv/MMS_FVM_Navier_Stokes/)
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Formal order of accuracy of the finite volume solver in SU2 for the laminar Navier-Stokes equations is assessed.
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*[2D Zero Pressure Gradient Flat Plate RANS Verification Case](/vandv/Flat_Plate/)
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Code-to-code comparisons of drag and skin friction on a turbulent flat plate is presented using data from the NASA Turbulence Modeling Resource.
Code-to-code comparisons for a bump in a channel, which results in pressure gradients, is presented using data from the NASA Turbulence Modeling Resource.
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