Near Wall Behavior of Implicit Large Eddy Simulations

Kokkinakis, Ioannis; Drikakis, Dimitris

doi:10.7712/100016.1868.8700

Cited by 1 publication

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References 17 publications

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“…The above numerical behavior leads to the formation of more energetic large scale turbulent structures, which are responsible for "blowing" the shock in the downstream direction. Our experience is that W9 can attain the same accuracy with the M5LM while using a coarser mesh [33][34][35]68,74 .…”

Section: A Mean Flowmentioning

confidence: 96%

Direct numerical simulation of supersonic flow and acoustics over a compression ramp

et al. 2020

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We present Direct Numerical Simulations (DNS) of shock turbulent boundary layers interaction (SBLI) at Mach 2.9 over a 24 • ramp. We study both the numerical accuracy and flow physics. Two classes of spatial reconstruction schemes are employed: the Monotonic Upstream centred Scheme for Conservation Laws (MUSCL) and the Weighted Essentially Non-Oscillatory (WENO), of accuracy ranging from 2 nd to 11 th-order. Using the canonical Taylor-Green vortex (TGV) test-case, a simple and computationally inexpensive rescaling of the candidate stencil values-within the context of the high-order WENO scheme-is proposed for reducing the numerical dissipation, particularly in underresolved simulations. For the compression ramp case, higher-order schemes are shown to capture the size of the SBLI separation zone more accurately, a consequence of resolving much finer turbulence structures. For second and fifthorder schemes, the energy of the unresolved small scale turbulence shifts the cascade of the turbulence kinetic energy spectrum, thus resulting in more energetic large scale turbulent structures. Consequently, the λ-shock foot shifts further downstream leading to a smaller separation bubble size. Nonetheless, other statistical quantities, such as the turbulence anisotropy invariant map and the turbulence kinetic energy budget terms, show little dependence on the type and order of the spatial reconstruction scheme. Finally, using the more accurate 9 th-order WENO results, it is reasoned that the interaction of the λ-shock with the post-shock relaxation region drives the low-frequency oscillation of the λ-shock.

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