A new flow simulation methodology applied to the turbulent backward-facing step

D. A. von Terzi; H. F. Fasel

A new flow simulation methodology applied to the turbulent backward-facing step

Research output: Contribution to conference › Paper › peer-review

Abstract

For the flow simulation methodology (FSM) of Speziale and Fasel, turbulent stresses and heat fluxes are computed using a state-of-the-art RANS turbulence model, but where the model contribution is scaled according to a contribution function which depends on the physical resolution of the computation. In flow regions (and instants of time) with high physical resolution only the smallest (unresolved) scales of motion are modelled while the larger structures are computed directly (similar to LES), whereas in regions of very coarse resolution an unsteady RANS simulation is recovered. The methodology thus may be classified as a RANS-LES hybrid or better, a unified approach to RANS and LES. In order to evaluate the potential of this methodology, it is applied to the unsteady flow over a backward-facing step at Re_H = 3000 and Ma = 0.25, with laminar separation and turbulent reattachment. The results are compared to DNS, LES, and unsteady RANS.

Original language	English
Publication status	Published - 2002
Externally published	Yes
Event	40th AIAA Aerospace Sciences Meeting and Exhibit 2002 - Reno, NV, United States Duration: 14 Jan 2002 → 17 Jan 2002

Conference

Conference	40th AIAA Aerospace Sciences Meeting and Exhibit 2002
Country/Territory	United States
City	Reno, NV
Period	14/01/02 → 17/01/02

Cite this

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title = "A new flow simulation methodology applied to the turbulent backward-facing step",

abstract = "For the flow simulation methodology (FSM) of Speziale and Fasel, turbulent stresses and heat fluxes are computed using a state-of-the-art RANS turbulence model, but where the model contribution is scaled according to a contribution function which depends on the physical resolution of the computation. In flow regions (and instants of time) with high physical resolution only the smallest (unresolved) scales of motion are modelled while the larger structures are computed directly (similar to LES), whereas in regions of very coarse resolution an unsteady RANS simulation is recovered. The methodology thus may be classified as a RANS-LES hybrid or better, a unified approach to RANS and LES. In order to evaluate the potential of this methodology, it is applied to the unsteady flow over a backward-facing step at ReH = 3000 and Ma = 0.25, with laminar separation and turbulent reattachment. The results are compared to DNS, LES, and unsteady RANS.",

author = "{von Terzi}, {D. A.} and Fasel, {H. F.}",

year = "2002",

language = "English",

note = "40th AIAA Aerospace Sciences Meeting and Exhibit 2002 ; Conference date: 14-01-2002 Through 17-01-2002",

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TY - CONF

T1 - A new flow simulation methodology applied to the turbulent backward-facing step

AU - von Terzi, D. A.

AU - Fasel, H. F.

PY - 2002

Y1 - 2002

N2 - For the flow simulation methodology (FSM) of Speziale and Fasel, turbulent stresses and heat fluxes are computed using a state-of-the-art RANS turbulence model, but where the model contribution is scaled according to a contribution function which depends on the physical resolution of the computation. In flow regions (and instants of time) with high physical resolution only the smallest (unresolved) scales of motion are modelled while the larger structures are computed directly (similar to LES), whereas in regions of very coarse resolution an unsteady RANS simulation is recovered. The methodology thus may be classified as a RANS-LES hybrid or better, a unified approach to RANS and LES. In order to evaluate the potential of this methodology, it is applied to the unsteady flow over a backward-facing step at ReH = 3000 and Ma = 0.25, with laminar separation and turbulent reattachment. The results are compared to DNS, LES, and unsteady RANS.

AB - For the flow simulation methodology (FSM) of Speziale and Fasel, turbulent stresses and heat fluxes are computed using a state-of-the-art RANS turbulence model, but where the model contribution is scaled according to a contribution function which depends on the physical resolution of the computation. In flow regions (and instants of time) with high physical resolution only the smallest (unresolved) scales of motion are modelled while the larger structures are computed directly (similar to LES), whereas in regions of very coarse resolution an unsteady RANS simulation is recovered. The methodology thus may be classified as a RANS-LES hybrid or better, a unified approach to RANS and LES. In order to evaluate the potential of this methodology, it is applied to the unsteady flow over a backward-facing step at ReH = 3000 and Ma = 0.25, with laminar separation and turbulent reattachment. The results are compared to DNS, LES, and unsteady RANS.

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M3 - Paper

AN - SCOPUS:84894298453

T2 - 40th AIAA Aerospace Sciences Meeting and Exhibit 2002

Y2 - 14 January 2002 through 17 January 2002

ER -

A new flow simulation methodology applied to the turbulent backward-facing step

Abstract

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