Ralf Deiterding
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Scalable Adaptive Lattice Boltzmann–LES Solver for High Reynolds Number Flows in Porous Media Open
The present study employs the adaptive lattice Boltzmann solver AMROC-LBM to numerically investigate turbulent flow through a wind tunnel containing porous media with a blockage ratio of 0.5. The porous structure comprises two interlaced c…
An efficient GPU-accelerated adaptive mesh refinement framework for high-fidelity compressible reactive flows modeling Open
This paper presents a heterogeneous adaptive mesh refinement (AMR) framework for efficient simulation of moderately stiff reactive problems. This framework features an elaborate subcycling-in-time algorithm along with a specialized refluxi…
High-resolution numerical simulation of rotating detonation waves with parallel adaptive mesh refinement Open
Simulations of rotating detonation engines are still dominated by solvers on uniform or statically refined meshes. Here, simulations of premixed rotating detonation waves are conducted using the block-structured adaptive mesh refinement (S…
View article: Flame acceleration and detonation transition in premixed and inhomogeneous supersonic flows
Flame acceleration and detonation transition in premixed and inhomogeneous supersonic flows Open
The reactive Navier–Stokes equations with adaptive mesh refinement and a detailed chemical reactive mechanism (11 species, 27 steps) were adopted to investigate a detonation engine considering the injection and supersonic mixing processes.…
An efficient, adaptive solver for accurate simulation of multicomponent shock-interface problems for thermally perfect species Open
A second-order-accurate finite volume method, hybridized by blending an extended double-flux algorithm and a traditionally conservative scheme, is developed. In this scheme, hybrid convective fluxes as well as hybrid interpolation techniqu…
Simulation of Passenger Car Aerodynamics in Overtaking Manoeuvres with an Adaptive Lattice Boltzmann Method Open
Using the freely available DriAer passenger car geometries, the benefits of our Cartesian adaptive lattice Boltzmann solver AMROC-LBM for simulating the aerodynamics of vehicles in motion are demonstrated. A large eddy simulation (LES) app…
The criticality of detonation transmission across hydrogen interfaces with non-uniform dilution Open
The present work considers the transmission of a detonation wave in hydrogen–oxygen from one gas to another where there is a different concentration of some inert diluent—inert gases nitrogen and argon were considered in this study. The pr…
View article: Numerical simulation of transpiration cooling for a high-speed boundary layer undergoing transition to turbulence
Numerical simulation of transpiration cooling for a high-speed boundary layer undergoing transition to turbulence Open
Cooling the surface of high-speed vehicles by injection of coolant into the flow stream aims to reduce the overall weight and cost of thermal protection systems. Here, the transpiration-based cooling method is studied for a Mach number M∞ …
Parallel adaptive simulation of rotating detonation engines Open
The rotating detonation engine is a promising realization of pressure gain combustion for propulsion and power generation systems. A rotating detonation engine running on ethylene-oxygen is simulated by using AMROC with a second-order accu…
A Computationally Efficient Hybrid Magnetic Field Correction for the Magnetohydrodynamic Equations Open
During the simulations of the magnetohydrodynamic equations, numerical errors might cause the formation of non-physical divergence components in the magnetic field. This divergence compromises the stability and accuracy of the simulations.…
Large eddy simulation of flow over a porous surface with a parallel and adaptive lattice Boltzmann method Open
We present the inner workings of our self-developed dynamically adaptive lattice Boltzmann software AMROC-LBM and apply the code to large eddy simulations that investigate the thickening and perturbance of turbulent boundary layers over ro…
Simulation of simplified urban flows using Lattice Boltzmann Method Open
Simulations of urban environments can have substantial benefits to public safety. This can be in scenarios of hazard assessment such as those related to the release of chemical and biological hazards. The current simple models have trouble…
A three-dimensional solver for simulating detonation on curvilinear adaptive meshes Open
A generic solver in a parallel Cartesian adaptive mesh refinement framework is extended to simulate detonations on three-dimensional structured curvilinear meshes. A second-order accurate finite volume method is used with grid-aligned Riem…
View article: Effects of Dilution and Pressure on Detonation Propagation Across an Inert Layer
Effects of Dilution and Pressure on Detonation Propagation Across an Inert Layer Open
In explosion accidents, inert layer(s) can be used to dampen or suppress detonation propagation. In detonation engines, the detonation may propagate in an inhomogeneous mixture with inert layer(s). Here, the detonation propagation in hydro…
The re-initiation of cellular detonations downstream of an inert layer Open
The current work aims to examine how the nature of cellular instabilities controls the re-initiation capability and dynamics of a gaseous detonation transmitting across a layer of inert (or non-detonable) gases. This canonical problem is t…
Flame–turbulence interactions during flame acceleration using solid and fluid obstacles Open
A combination of solid and transverse jet obstacles is proposed to trigger flame acceleration and deflagration-to-detonation transition (DDT). A numerical study of this approach is performed by solving the reactive Navier–Stokes equations …
A curvilinear lattice Boltzmann scheme for thermal flows Open
Lattice Boltzmann schemes are known for their efficiency and low dissipation properties. However, the standard lattice Boltzmann method (LBM) is limited to Cartesian grids, and this approach can be troublesome when approximating thermal fl…
Oblique Detonation Wave Control with O3 and H2O2 Sensitization in Hypersonic Flow Open
This numerical study investigates the effects of adding a small amount of ignition promoters for controlling the wedge-induced oblique shock wave (OSW) to oblique detonation wave (ODW) transition in a premixed hydrogen–air mixture at hyper…
Numerical Investigation of Detonation Propagation Through Small Orifice Holes Open
Seeking to better understand the physical phenomena underlying detonation wave propagation through small holes (especially the phenomenon of detonation re-initiation or its failure), we investigated the propagation of a detonation wave alo…
Effect of transverse jet position on flame propagation regime Open
We studied the mechanisms of flame acceleration (FA) and deflagration to detonation transition (DDT) triggered by a combination of solid and jet obstacles. The Navier–Stokes equations with a detailed hydrogen–air kinetics model were utiliz…
Numerical study of detonation wave propagation modes in annular channels Open
Modes of detonation wave propagation in annular channels were investigated numerically by using the adaptive mesh refinement technique. Two-dimensional, reactive Euler equations with a detailed hydrogen/oxygen reaction model were adopted i…
Mechanism of detonation stabilization in a supersonic model combustor Open