Compressible Boundary Layer Predictions at High Reynolds Number using Hybrid LES/RANS Methods

Choi, Jung Il; Edwards, Jack R.; Baurle, Robert A.

doi:10.2514/6.2008-4175

Cited by 8 publications

(9 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this work, the Menter-BSL turbulence model 7 The LES/RAS blending function is designed such that the RAS formulation transitions to the LES formulation in the outer region of the boundary layer, near the upper edge of the log layer. As previous studies have indicated 9 , targeting the transition for this region at the edge of the log layer within the turbulent boundary layer yields the most resolved turbulence without adversely affecting the universality of the boundary layer. The blending from LES to RAS is done smoothly using the following function 10 :…”

Section: Hybrid Les/ras Formulationmentioning

confidence: 96%

“…These fluctuations are scaled according to boundary-layer similarity laws before being superimposed to a mean flow RAS profile. The general procedure used for this process is described by Edwards and others, 9,18,19 and several important characteristics of the procedure are described here.…”

Section: B Turbulence Recycling Proceduresmentioning

confidence: 99%

“…For both the fine grid and coarse grid cases, boundary layer velocity profiles at several planes upstream of the step were compared to theoretical predictions based on Cole's Law-of-the-Wall formulation and the original RAS solutions under the van Driest transformation described in Ref. 9. These three planes included the inflow plane, the donor recycling plane, and a plane at the step corner.…”

Section: A Comparison With Experimentsmentioning

confidence: 99%

See 2 more Smart Citations

Simulation of a Wall-Bounded Flow Using a Hybrid LES/RAS Approach with Turbulence Recycling

Quinlan

McDaniel

Baurle

2012

42nd AIAA Fluid Dynamics Conference and Exhibit

Self Cite

View full text Add to dashboard Cite

Section: Hybrid Les/ras Formulationmentioning

confidence: 96%

Section: B Turbulence Recycling Proceduresmentioning

confidence: 99%

Section: A Comparison With Experimentsmentioning

confidence: 99%

See 1 more Smart Citation

Simulation of a Wall-Bounded Flow Using a Hybrid LES/RAS Approach with Turbulence Recycling

Quinlan

McDaniel

Baurle

2012

42nd AIAA Fluid Dynamics Conference and Exhibit

Self Cite

View full text Add to dashboard Cite

“…These fluctuations are scaled according to boundary-layer similarity laws before being superimposed to a mean flow profile. The general procedure used for this process is described by Choi et al 45 .…”

Section: Hypersonic Propulsion Flowpath Application: D1 Settles Smentioning

confidence: 99%

Low-Dissipation Advection Schemes Designed for Large Eddy Simulations of Hypersonic Propulsion Systems

White

Baurle²,

Fisher³

et al. 2012

48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

Self Cite

View full text Add to dashboard Cite

The 2nd-order upwind inviscid flux scheme implemented in the multi-block, structured grid, cell centered, finite volume, high-speed reacting flow code VULCAN has been modified to reduce numerical dissipation. This modification was motivated by the desire to improve the codes ability to perform large eddy simulations. The reduction in dissipation was accomplished through a hybridization of non-dissipative and dissipative discontinuity-capturing advection schemes that reduces numerical dissipation while maintaining the ability to capture shocks. A methodology for constructing hybrid-advection schemes that blends nondissipative fluxes consisting of linear combinations of divergence and product rule forms discretized using 4th-order symmetric operators, with dissipative, 3rd-or 4th -order reconstruction based upwind flux schemes was developed and implemented. A series of benchmark problems with increasing spatial and fluid dynamical complexity were utilized to examine the ability of the candidate schemes to resolve and propagate structures typical of turbulent flow, their discontinuity capturing capability and their robustness. A realistic geometry typical of a high-speed propulsion system flowpath was computed using the most promising of the examined schemes and was compared with available experimental data to demonstrate simulation fidelity. Nomenclature

show abstract

“…well within the log law region), a dual log layer can appear. 22,23 Conversely, if the transition point is enforced at a y + value that extends well into the defect layer, then the level of resolved turbulence will be limited. Details on a procedure to analytically determine the value for α that corresponds to a target y + value is described in Ref.…”

Section: Physical and Numerical Model Descriptionmentioning

confidence: 99%

Hybrid Reynolds-Averaged/Large-Eddy Simulations of a Co-Axial Supersonic Free-Jet Experiment

Baurle

Edwards

2009

47th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

Self Cite

View full text Add to dashboard Cite

Reynolds-averaged and hybrid Reynolds-averaged/large-eddy simulations have been applied to a supersonic coaxial jet flow experiment. The experiment utilized either helium or argon as the inner jet nozzle fluid, and the outer jet nozzle fluid consisted of laboratory air. The inner and outer nozzles were designed and operated to produce nearly pressure-matched Mach 1.8 flow conditions at the jet exit. The purpose of the computational effort was to assess the state-of-the-art for each modeling approach, and to use the hybrid Reynolds-averaged/large-eddy simulations to gather insight into the deficiencies of the Reynolds-averaged closure models. The Reynolds-averaged simulations displayed a strong sensitivity to choice of turbulent Schmidt number. The baseline value chosen for this parameter resulted in an over-prediction of the mixing layer spreading rate for the helium case, but the opposite trend was noted when argon was used as the injectant. A larger turbulent Schmidt number greatly improved the comparison of the results with measurements for the helium simulations, but variations in the Schmidt number did not improve the argon comparisons. The hybrid simulation results showed the same trends as the baseline Reynolds-averaged predictions. The primary reason conjectured for the discrepancy between the hybrid simulation results and the measurements centered around issues related to the transition from a Reynolds-averaged state to one with resolved turbulent content. Improvements to the inflow conditions are suggested as a remedy to this dilemma. Comparisons between resolved second-order turbulence statistics and their modeled Reynolds-averaged counterparts were also performed.

show abstract

Compressible Boundary Layer Predictions at High Reynolds Number using Hybrid LES/RANS Methods

Cited by 8 publications

References 28 publications

Simulation of a Wall-Bounded Flow Using a Hybrid LES/RAS Approach with Turbulence Recycling

Simulation of a Wall-Bounded Flow Using a Hybrid LES/RAS Approach with Turbulence Recycling

Low-Dissipation Advection Schemes Designed for Large Eddy Simulations of Hypersonic Propulsion Systems

Hybrid Reynolds-Averaged/Large-Eddy Simulations of a Co-Axial Supersonic Free-Jet Experiment

Contact Info

Product

Resources

About