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Article
Friction Drag Variation via Spanwise Transversal Surface Waves
The introduction of spanwise velocity is a promising technique to effect the near-wall turbulent flow field to influence friction drag. However, the essential physical mechanism which significantly reduces fri...
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Chapter and Conference Paper
Numerical Investigation of Shock Wave Boundary-Layer Interaction Using a Zonal RANS-LES Ansatz
In this paper a zonal RANS/LES approach is presented in which the regions with attached boundary-layers are computed via RANS and the regions with separated flows by using LES. The transition from RANS to LES ...
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Chapter and Conference Paper
A Cartesian Cut-Cell Solver for Compressible Flows
A Cartesian cut-cell solver is presented to simulate two- and three-dimensional viscous, compressible flows on arbitrarily refined graded meshes. The finite-volume method uses cut cells at the boundaries rende...
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Article
Numerical Simulation of Riblet Controlled Spatial Transition in a Zero-Pressure-Gradient Boundary Layer
To analyze the fundamental physical mechanism which determines the dam** effect of a riblet surface on three-dimensional transition several numerical simulations of spatial transition in a flat plate zero-pr...
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Chapter and Conference Paper
Numerical Simulation of Riblet Controlled Spatial Transition
To analyze the fundamental physical mechanism which determines the dam** effect of a riblet surface on three-dimensional transition several numerical simulations of spatial transition in a flat plate zero-pr...
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Chapter and Conference Paper
LES of the Flow over a High-Lift Airfoil Configuration
A large-eddy simulation of the flow over a high-lift airfoil configuration consisting of a slat and a main wing is performed at a freestream Mach number M=0.16 and an angle of attack of 13°. The Reynolds numbe...
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Chapter and Conference Paper
Numerical Simulation of Nasal Cavity Flow Based on a Lattice-Boltzmann Method
The flow in a real human nose is numerically simulated at steady inspiration and expiration. The analysis uses a Lattice Boltzmann method (LBM) which is particularly suited for flows in extremely intricate geo...
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Chapter and Conference Paper
Interaction of Wing-Tip Vortices and Jets in the Extended Wake
The interaction of wing-tip vortices and jets in the extended wake is experimentally and numerically investigated. The measurements focus on the unsteady wake of a swept-wing half-model equipped with an engine...
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Chapter and Conference Paper
Wing-Tip Vortex / Jet Interaction in the Extended Near Field
The vortex wake behind a half wing is spatially simulated up to the extended near field. Instabilities of the wing tip vortex are analyzed. Results from wind tunnel measurements are used as inflow boundary co...
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Chapter and Conference Paper
Meandering of Wing-Tip Vortices Interacting with a Cold Jet in the Extended Wake
The spatial development of a vortex wake behind a half wing is simulated up to the extended near field. Results from wind tunnel measurements are used as inflow boundary conditions for an LES of the wake regi...
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Chapter
Noise Prediction for Turbulent Coaxial Jets
The aerodynamic/acoustic fields of various single and coaxial jet configurations are determined by a hybrid method to analyse the noise generation mechanisms. Three jet configurations with an artificial nozzle...
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Chapter and Conference Paper
Numerical Analysis of Sound Generating Mechanisms of a High-Lift Device
In this study the flow field and the acoustic field over a high-lift configuration consisting of a deployed slat and a main wing is numerically analyzed. The flow parameters are Ma = 0.16, Re = 1.4 * 106, αSlat =...
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Chapter and Conference Paper
Investigation of Lattice Boltzmann Methods for LES
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Chapter and Conference Paper
Large-Eddy Simulation of Tundish Flow
Large-eddy simulations (LES) of a continuous tundish flow are carried out to investigate the turbulent flow structure and vortex dynamics. The numerical computations are performed by solving the viscous conser...
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Chapter and Conference Paper
A Hybrid LES/CAA Method for Aeroacoustic Applications
This paper describes a hybrid LES/CAA approach for the numerical prediction of airframe and combustion noise. In the hybrid method first a Large-Eddy Simulation (LES) of the flow field containing the acoustic ...
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Chapter and Conference Paper
Large-Eddy Simulation of Attached Airfoil Flow
A Large-eddy simulation version of the FLOWer code is introduced to compute attached flow around a quasi three-dimensional airfoil at a Mach number Ma = 0.088, Reynolds number Re = 8 × 105, and an angle of attack...
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Chapter and Conference Paper
Large-Eddy Simulation of a Jet in a Crossflow
The flow field induced by the interaction between a single jet flow exhausting from a pipe and a turbulent flat plate boundary layer at a local Reynolds number of Re ∞ = 400, 000 is numerically ...
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Article
Large-Scale CFD Data Handling in a VR-Based Otorhinolaryngological CAS-System using a Linux-Cluster
Many of the operations to eliminate complaints concerning respiration impairments fail. In order to improve the success rate, it is important to recognize the responsiveness of the flow field within the nasal ...
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Chapter and Conference Paper
LES of Turbulent Boundary Layers
The paper presents large-eddy simulations of sub- and supersonic boundary layers. A second-order accurate scheme is used for the simulation of the flow field with non-reflecting boundary conditions and sponge ...
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Chapter and Conference Paper
LES of Turbulent Flows Trough 90°-Pipe Bends on NEC SX-4
Oscillatory phenomena in turbulent flows through 90°-pipe bends are numerically investigated using large-eddy simulations on the NEC SX-4 of the High-Performance Computing Center Stuttgart (HLRS). Since the ra...
