Numerical investigation of internal and external three-dimensional flow separation

A. Gross, R. Jacobi, S. Wernz, H. Fasel

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Separation of wall bounded flows for Navy relevant geometries is a highly complex phenomenon. Due to the shape of underwater vehicles (submarines, torpedoes, low aspect ratio lifting or control surfaces) separation is often three-dimensional (3D). Because of the relatively high Reynolds numbers involved, separation is always associated with considerable unsteadiness. This unsteadiness is caused by large coherent structures that are a consequence of hydrodynamic instability mechanisms of the mean flow. The combination of threedimensionality and unsteadiness results in a highly complex time-dependent topology of the separated region. We are simulating 3D separation bubbles in internal (diffuser) and external flows. The diffuser flow simulations are conducted in collaboration with experiments at Stanford University by J. Eaton. The flow is turbulent and difficult to access by direct numerical simulations (DNS). The objective here is to develop, validate, and advance appropriate hybrid turbulence modeling capabilities that will lower the computational expense associated with such simulations. In a combined numerical/experimental effort we are also studying laminar separation bubbles in external flows. For these simulations we are employing highly resolved DNS. The objective here is to obtain high-fidelity flow data that will be analyzed to obtain a deeper understanding of the various physical mechanisms governing separation, transition, and reattachment of 3D bubbles. Ultimately, such understanding may pave the way for the development of effective and efficient flow control strategies for preventing separation in practical applications.

Original languageEnglish (US)
Title of host publication2008 Proceedings of the Department of Defense High Performance Computing Modernization Program
Subtitle of host publicationUsers Group Conference - Solving the Hard Problems
Pages52-60
Number of pages9
DOIs
StatePublished - Dec 1 2008
Event2008 Department of Defense High Performance Computing Modernization Program: Users Group Conference - Solving the Hard Problems - Seattle, WA, United States
Duration: Jul 14 2007Jul 17 2007

Publication series

Name2008 Proceedings of the Department of Defense High Performance Computing Modernization Program: Users Group Conference - Solving the Hard Problems

Other

Other2008 Department of Defense High Performance Computing Modernization Program: Users Group Conference - Solving the Hard Problems
CountryUnited States
CitySeattle, WA
Period7/14/077/17/07

ASJC Scopus subject areas

  • Computational Theory and Mathematics
  • Computer Science Applications
  • Theoretical Computer Science

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    Gross, A., Jacobi, R., Wernz, S., & Fasel, H. (2008). Numerical investigation of internal and external three-dimensional flow separation. In 2008 Proceedings of the Department of Defense High Performance Computing Modernization Program: Users Group Conference - Solving the Hard Problems (pp. 52-60). [4755843] (2008 Proceedings of the Department of Defense High Performance Computing Modernization Program: Users Group Conference - Solving the Hard Problems). https://doi.org/10.1109/DoD.HPCMP.UGC.2008.25