Heat Transfer Prediction in Transitional Hypersonic Flow

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: FA9550-09-C-0172
Agency Tracking Number: F08B-T13-0044
Amount: $100,000.00
Phase: Phase I
Program: STTR
Awards Year: 2009
Solicitation Year: 2008
Solicitation Topic Code: AF08-BT13
Solicitation Number: 2008.B
Small Business Information
1330 Charleston Road, Mountain View, CA, 94043
DUNS: 179576715
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Shoreh Hajiloo
 General Manager
 (650) 691-6067
Business Contact
 Parviz Moin
Title: President
Phone: (650) 224-4882
Email: moin@turbulentflow.com
Research Institution
 Stanford University
 Sanjiva Lele
 Mechanical Engineering Dept.
Stanford, CA, 94305
 (650) 723-7721
 Nonprofit college or university
Accurate prediction of heat transfer in hypersonic boundary layers undergoing transition from laminar to turbulent regime is a technical challenge. Heat transfer overshoot at transition region is of particular interest here. We have proposed a two pronged approach for this problem. On one hand we will conduct very accurate Direct Numerical Simulation (DNS) studies to understand the mechanisms of the transition process. This will be done at the academic institution. The initial DNS studies will have artificial triggering of transition by suction/blowing boundary conditions at an upstream slot to reduce domain size. Later, a comprehensive DNS investigation of the naturally occurring transition region will be carried out.  CASCADE will undertake a modeling approach using Reynolds Averaged Naiver Stokes (RANS) simulations. Specifically, the v2f turbulence model will be used for its ability to handle turbulence anisotropy encountered in boundary layer flows. An intermittency based transition model will be the starting point. The idea is to artificially alter the turbulence energy redistribution in at the transition onset to generate the overshoot. The detailed understanding of the transition regime gained from DNS studies will help in modifying the turbulence energy redistribution in a physically meaningful manner. BENEFIT: It is envisioned that a successful completion of the project will lead to an enhanced understanding of the physical mechanisms behind the transition regime of hypersonic boundary layers. Especially, the processes behind the overshoot at the onset of transition will be thoroughly understood from the Direct Numerical Simulation (DNS) studies. This will ultimately result in the development of advanced transition models based on the Reynolds Averaged Navier Stokes (RANS) approach. Specifically, the outcome will be a modified v2f model capable of handling transitional flows in hypersonic systems. The developed tool will be immensely useful to the designers of hypersonic vehicles subjected to extreme thermal loads. Any industry involved in space access, supersonic flight and aircraft engine design will be potentially benefited. All these sectors can be targeted for licensing opportunities for our tools that will be developed from this project. The knowledge gained will also enable us to do consulting for the industry.)

* Information listed above is at the time of submission. *

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