Turbulence Modeling Resource

NASA's 40% Challenge and CFD Prediction Error Assessment Workshop 2018

As a project under NASA's Aeronautics Research Mission Directorate, the Transformational Tools and Technologies (T^3) Project defined a Technical Challenge to:

• Identify and down-select critical turbulence, transition, and numerical method technologies for 40% reduction in predictive error against standard test cases for turbulent separated flows, evolution of free shear flows and shock-boundary layer interactions on state-of-the-art high performance computing hardware.

The deadline for achieving this improvement was May 2018. The Standard Test Cases Document (version 6, pdf file, 3.3 MB) describes the proposed test cases as well as metrics. Additional optional test cases are also listed. This challenge applies to both RANS as well as scale-resolving methods, as described in the document.

The 5 primary cases in the Standard Test Cases Document are as follows:

• 2-D NASA Hump
  • This is case 2DWMH on the TMR website (experimental data and other details can be found here)
• Axisymmetric Transonic Bump
  • This is case ATB on the TMR website (experimental data and other details can be found here)
• 2-D Compressible Mixing Layer
  • This case is currently not covered on the TMR website
  • Details can be found in the references listed in the Standard Test Cases Document
  • Experimental data: Goebel_data.tar.gz (tarred and gzipped)
• Round Jet
  • These are cases ASJ (set point 3), AHSJ (set point 23), and ANSJ (set point 7) on the TMR website (experimental data and other details can be found here)
• Axisymmetric Shock Wave Boundary Layer Interaction at M=2.85
  • This case is currently not covered on the TMR website
  • Details can be found in the references listed in the Standard Test Cases Document
  • Experimental data: axi_swbli_data.tar.gz (tarred and gzipped)

CFD Prediction Error Assessment Workshop 2018

March 20-22, 2018
Suffolk, Virginia

As this challenge under NASA's Revolutionary Computational Aerosciences (RCA) drew to a close, NASA's Transformational Tools and Technologies (T^3) Project held a workshop to highlight and discuss progress made. This workshop was comprehensive (not just related to the RCA standard test cases), covering the entire research portfolio, including experimental work. There was also discussion concerning the status and future of turbulence modeling (both within NASA and within the aerospace community in general), along the lines of the University of Michigan/NASA Symposium on Advances in Turbulence Modeling, held in 2017.

The venue for the March 20-22 workshop was the Lockheed-Martin Center for Innovation on 8000 Harbourview Boulevard, Suffolk, VA 23435.

Links:

• Workshop Agenda

Specific questions about the workshop should be addressed to: mujeeb.r.malik@nasa.gov

The talks from this workshop are not available here. If you are interested in any specific talk, please contact the author of the talk directly (it is up to each author whether or not to make their talk available).

IN OVERVIEW:

• RANS models showed the potential to be more accurate when suitably tailored, but most of the improvements remain problem-specific
• Intermediate level fidelity (WMLES and HRLES) methods showed potential, but model sensitivity needs extensive further assessment
• High-fidelity methods (WRLES) of impressive size are clearly capable, but grid convergence and expense considerations require more work even for moderate Reynolds numbers

Return to: Turbulence Modeling Resource Home Page

Recent significant updates:
12/04/2018 - added overview
03/15/2018 - updated agenda posted (V9)
02/28/2018 - workshop registration closed
02/08/2018 - clarification about limited attendance

Page Curators: Christopher Rumsey, Ethan Vogel, Clark Pederson
Last Updated: 11/24/2025