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Chapter and Conference Paper
Dynamic Load Balancing of a Coupled Lagrange Particle Tracking Solver for Direct Injection Engine Application
A dynamic load balancing technique for multiphysics simulation methods based on hierarchical Cartesian meshes for a direct injection internal combustion engine application is presented. A finite-volume method ...
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Article
Open AccessImpact of 2D engine nacelle flow on buffet
Numerical studies on the interaction of nacelle and airfoil shock dynamics are performed. To keep the computational cost at an acceptable level, first 2D investigations on the interaction of nacelle and airfoi...
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Chapter and Conference Paper
Analysis of the hot gas ingress into the wheel space of an axial turbine stage
The thermal efficiency of gas turbines strongly depends on the turbine inlet temperature. Increasing the inlet gas temperature improves the engine performance, but results in new challenges for the cooling of ...
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Article
Open AccessInvestigation of Lorentz force–induced flow of NaNO3-electrolyte for magnetic field–assisted electrochemical machining
Pulsed electrochemical machining offers great potential to meet growing demands on components like miniaturization, efficiency, and functionalization. Current research activities show that the electrochemical ...
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Chapter
On the Use of Active Pre-chambers and Bio-hybrid Fuels in Internal Combustion Engines
Pre-chamber combustion systems combined with bio-hybrid fuels allow for an efficiency increase of internal combustion engines and a reduction of engine-out emissions. Experimental and numerical investigations ...
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Chapter and Conference Paper
Comparison of Two Airfoils for Active Drag Reduction in Turbulent Flow
Active flow control of the turbulent flow over two airfoils of different shape is performed with the goal of increasing the overall aerodynamic efficiency. Large-eddy simulations are performed to investigate t...
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Chapter and Conference Paper
Drag Reduction by Surface Actuation
The flow over an DRA2303 wing section is controlled by spanwise traveling transversal surface waves. The actuated flow field is investigated by large-eddy simulation. Approximately
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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 and Conference Paper
Numerical Analysis of Ethanol and 2-Butanone Direct Injection in an Internal Combustion Engine
The mixture formation of air and the gasoline surrogates Ethanol and 2-Butanone is numerically investigated using large-eddy simulations of the direct-injection into an internal combustion engine. The multiphy...
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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
Dynamic Load Balancing for Coupled Simulation Methods
A dynamic load balancing technique for simulation methods based on hierarchical Cartesian meshes is presented for two applications in this paper. The first method is a hybrid CFD/CAA solver for the prediction ...
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Article
Numerical Investigation of Jet-Wake Interaction for a Dual-Bell Nozzle
The turbulent wake of a planar generic space launcher equipped with a dual-bell nozzle is numerically investigated to examine the interaction of the dual-bell nozzle jet and the wake flow. The simulation is pe...
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Article
Large-Eddy Simulation of the Unsteady Full 3D Rim Seal Flow in a One-Stage Axial-Flow Turbine
The flow field in a complete one-stage axial-flow turbine with 30 stator and 62 rotor blades is investigated by large-eddy simulation (LES). To solve the compressible Navier-Stokes equations, a massively paral...
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Article
An Adaptive Cartesian Mesh Based Method to Simulate Turbulent Flows of Multiple Rotating Surfaces
An efficient Cartesian cut-cell/level-set method based on a multiple grid approach to simulate turbulent turbomachinery flows is presented. The finite-volume approach in an unstructured hierarchical Cartesian ...
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Article
Numerical Analysis of the Impact of the Interior Nozzle Geometry on Low Mach Number Jet Acoustics
The flow and acoustic fields of subsonic turbulent hot jets exhausting from three divergent nozzles at a Mach number M=0.12 based on the nozzle exit velocity are conducted using a hybrid CFD-CAA method. The flow ...
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Chapter and Conference Paper
The Direct-Hybrid Method for Computational Aeroacoustics on HPC Systems
Classic hybrid methods for computational aeroacoustics use different solvers and methods to predict the flow field and the acoustic pressure field in two separate steps, which involves data exchange via disk I...
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Chapter and Conference Paper
Validation of Particle-Laden Large-Eddy Simulation Using HPC Systems
In this contribution, results of a direct particle-fluid simulation (DPFS) are compared with direct numerical simulations and large-eddy simulations (LES) using a popular Euler-Lagrange method (ELM). DPFS faci...
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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 \(72^{\circ }\) ...
