Cavity Flow Assessment Using Advanced Turbulence Methods

Liggett, Nicholas D.; Smith, Marilyn J.

doi:10.2514/1.c031019

Cited by 13 publications

(3 citation statements)

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“…The salient turbulent scales in the separated wake are larger, so that the significant physics of the flow can be captured with moderate mesh refinement applied in uRANS. [5,56] The introduction of these advanced wake turbulence closures, even on the same meshes and with the same time steps can greatly improve the predicted location of separation over uRANS. [5,56] Halving the uRANS time steps has been observed to improve rotor loads predictions for conditions at the edge of the flight envelope (high thrust) [57], although time steps comparable to uRANS results with sufficient convergence via subiterations are practical for most flight conditions.…”

Section: Turbulence Modelingmentioning

confidence: 99%

“…[5,56] The introduction of these advanced wake turbulence closures, even on the same meshes and with the same time steps can greatly improve the predicted location of separation over uRANS. [5,56] Halving the uRANS time steps has been observed to improve rotor loads predictions for conditions at the edge of the flight envelope (high thrust) [57], although time steps comparable to uRANS results with sufficient convergence via subiterations are practical for most flight conditions. Recent research is focusing on improved predictions of the turbulence that exits the uRANS domain, enters the wake domain, re-enters the uRANS domain, and so on.…”

Section: Turbulence Modelingmentioning

confidence: 99%

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Dual-solver hybrid computational approaches for design and analysis of vertical lift vehicles

Smith

Moushegian

2021

Aeronaut. j.

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The cost of Reynolds-Averaged Navier-Stokes simulations can be restrictive to implement in aeromechanics design and analysis of vertical lift configurations given the cost to resolve the flow on a mesh sufficient to provide accurate aerodynamic and structural loads. Dual-solver hybrid methods have been developed that resolve the configuration and the near field with the Reynolds-Averaged Navier-Stokes solvers, while the wake is resolved with vorticity-preserving methods that are more cost-effective. These dual-solver approaches can be integrated into an organisation’s workflow to bridge the gap between lower-fidelity methods and the expensive Reynolds-Averaged Navier-Stokes when there are complex physics present. This paper provides an overview of different dual-solver hybrid methods, coupling approaches, and future efforts to expand their capabilities in the areas of novel configurations and operations in constrained and turbulent environments.

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Section: Turbulence Modelingmentioning

confidence: 99%

Section: Turbulence Modelingmentioning

confidence: 99%

Dual-solver hybrid computational approaches for design and analysis of vertical lift vehicles

Smith

Moushegian

2021

Aeronaut. j.

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show abstract

“…Bu çalışmalarda iki farklı türbülans modeli, DES yaklaşımının geçiş fonksiyonuna göre akış alanı içinde otomatik olarak belirlenmekte ve LES-URANS hibrit yaklaşımına göre hesaplama zamanının daha düşük olmasını sağlamaktadır. Liggett ve Smith [9] kendi sayısal kodlarını Menter kkayma gerilmesi iletimi RANS yaklaşımı ile DES modelini alt-ağ-ölçekli (subgrid scale) türbülans modelini içerek şekilde geliştirmiş ve literatürde bulunan hibrit olmayan uRANS türbülans modelleri ile karşılaştırmışlardır. Çalışma Mach sayısı M ∞ = 0,85 için akış alanı ve kavite tarafından üretilen akustik sinyali sayısal olarak hesaplamıştır ve SST k-DES hibrit modelinin deneysel veriler ile daha uyumlu sonuçlar ürettiği görülmüştür.…”

Section: Gi̇ri̇ş (Introduction)unclassified