21 Result(s)
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Chapter and Conference Paper
Numerical Investigation of a Porous Trailing Edge by a Zonal RANS/LES Simulation
A hybrid Reynolds-averaged Navier-Stokes (RANS)/large-eddy simulation (LES) approach for flows with porous surfaces is presented. For the two-dimensional geometry considered, a computationally cheap 2D-RANS si...
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Chapter
Numerical Analysis of the Turbulent Wake for a Generic Space Launcher with a Dual-Bell Nozzle
The turbulent wake of an axisymmetric generic space launcher equipped with a dual-bell nozzle is simulated at transonic ( \(Ma_\infty = 0.8\) and \(Re_D = 4.3\cdot 10^5\) ) and supersonic ( \(Ma_\infty = 3\) a...
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Chapter and Conference Paper
Interaction of Acoustic and Entropy Waves with Shocks
of and entropy waves with an oblique shock occurring upstream of a cone is investigated. The three-dimensional supersonic Ma \(=\) = 5.9 flow over a \(30^{\circ }\) 30 ∘ half angle cone...
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Chapter and Conference Paper
Towards Adjoint-Based Trailing-Edge Noise Minimization Using Porous Material
In this paper, we present a discrete adjoint-based optimization framework to obtain the optimal distribution of the porous material over the trailing edge of a 3-D flat plate. The near-body strength of the noi...
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Chapter and Conference Paper
Large-Eddy Simulation of the Flow Field in a Rotating Axial Fan
Large-eddy simulation (LES) results of the turbulent flow field in a \(72^{\circ }\) ...
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Chapter and Conference Paper
Investigation of the Effect of a Realistic Nozzle Geometry on the Jet Development
Highly resolved large-eddy simulations (LES) of a helicopter engine jet including the nozzle geometry are performed. A flow solver for compressible flow based on hierarchically refined Cartesian meshes and a c...
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Chapter and Conference Paper
Simulation of a Helicopter Engine Jet Including a Realistic Nozzle Geometry
of a helicopter engine jet at a Reynolds number of Re = 750,000 and a Mach number of M = 0.341 is performed. The influence of a realistic nozzle geometry on the jet properties is analyzed by using hig...
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Chapter and Conference Paper
A Hybrid Discontinuous Galerkin-Finite Volume Method for Computational Aeroacoustics
A hybrid method for a fully coupled determination of aerodynamic sound is introduced. From the instantaneous velocity and vorticity, determined by approximate solutions of the Navier-Stokes equations, acoustic...
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Chapter
Numerical Investigation of the Combined Effects of Gravity and Turbulence on the Motion of Small and Heavy Particles
Numerical studies [1, 2] show that the influence of gravity and turbulence on the motion of small and heavy particles is not a simple superposition. However, in [3] it is shown that these studies may be artifi...
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Chapter
Partitioned Fluid-Structure Interaction on Solution-Adaptive Hierarchical Cartesian Grids
A solution-adaptive hierarchical Cartesian cut-cell method is validated for fluid-structure interaction problems involving rigid bodies. The response of a tandem configuration of elastically supported cylin...
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Chapter
A Level-Set Based Cartesian Grid Method to Simulate In-Cylinder Flow
This work discusses the extension of a three-dimensional, strictly conservative Cartesian cut-cell based method to meet the requirements for the simulation of in-cylinder flow and other flows bounded by comple...
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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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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
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 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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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 ...
