Michael Oevermann
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View article: Numerical investigation of cavitation erosion in high-pressure fuel injector in the presence of surface deviations
Numerical investigation of cavitation erosion in high-pressure fuel injector in the presence of surface deviations Open
This study investigates cavitation-induced erosion in high-pressure fuel injectors using numerical simulations, focusing on the effects of surface deviations, turbulence modeling, and a refined approach for the erosion assessment. The prop…
View article: Assessing the Multi-Regime Capability of the Super-Grid Linear Eddy Model (SG-LEM) Using the Darmstadt Multi-Regime Burner
Assessing the Multi-Regime Capability of the Super-Grid Linear Eddy Model (SG-LEM) Using the Darmstadt Multi-Regime Burner Open
Recent advances in combustion modelling for Large Eddy Simulation (LES) have increasingly utilised lower-dimensional manifolds, such as Flamelet Generated Manifolds and Flamelet/Progress Variable methods, due to their computational efficie…
View article: Investigation of coarse-graining parameters for super-grid LEM closure applied to LES of practical bluff-body flames
Investigation of coarse-graining parameters for super-grid LEM closure applied to LES of practical bluff-body flames Open
Large Eddy Simulation (LES) coupled with the Linear Eddy Model (LEM) provides a robust method for studying turbulent combustion, but it is computationally expensive due to the need for highly resolved sub-grid LEM domains. These domains si…
View article: Multiple representative interactive linear eddy model: Investigation of turbulence chemistry interaction and evaluation of progress variable definition and PDFs
Multiple representative interactive linear eddy model: Investigation of turbulence chemistry interaction and evaluation of progress variable definition and PDFs Open
Improving the predictions of unsteady effects in combustion processes requires novel combustion models that include turbulence chemistry interaction effects. The Multiple Representative Interactive Linear Eddy Model (MRILEM) is an improved…
View article: Assessment of a multiphase formulation of one-dimensional turbulence using direct numerical simulation of a decaying turbulent interfacial flow
Assessment of a multiphase formulation of one-dimensional turbulence using direct numerical simulation of a decaying turbulent interfacial flow Open
The interaction between turbulence and surface tension is studied numerically using the one-dimensional-turbulence (ODT) model. ODT is a stochastic model simulating turbulent flow evolution along a notional one-dimensional line of sight by…
View article: Pressure gain combustion for gas turbines: Analysis of a fully coupled engine model
Pressure gain combustion for gas turbines: Analysis of a fully coupled engine model Open
The ``Shockless Explosion Combustion" (SEC) concept for gas turbine combustors, introduced in 2014, approximates constant volume combustion (CVC) by harnessing acoustic confinement of autoigniting gas packets. The resulting pressure waves …
View article: Effects of thermal barrier coating porosity on combustion and heat losses in a light duty diesel engine
Effects of thermal barrier coating porosity on combustion and heat losses in a light duty diesel engine Open
Plasma sprayed thermal barrier coatings (TBCs), applied in internal combustion engines, can have a profound impact on the apparent rate of heat release. Upon fuel jet contact with the piston wall, the heat loss seems to increase compared t…
View article: A super-grid approach for LES combustion closure using the Linear Eddy Model
A super-grid approach for LES combustion closure using the Linear Eddy Model Open
LES-LEM is a simulation approach for turbulent combustion in which the stochastic Linear Eddy Model (LEM) is used for sub-grid mixing and combustion closure in Large-Eddy Simulation (LES). LEM resolves, along a one-dimensional line, all sp…
View article: A pressure-coupled Representative Interactive Linear Eddy Model (RILEM) for engine simulations
A pressure-coupled Representative Interactive Linear Eddy Model (RILEM) for engine simulations Open
The Representative Linear Eddy Model (RILEM) was introduced by Lackmann et al. (2018) as an alternative modeling approach to simulate turbulent non-premixed combustion in engines. The model utilizes a RANS approach for turbulence and the L…
View article: Diffraction of shock waves through a non-quiescent medium
Diffraction of shock waves through a non-quiescent medium Open
An investigation of shock diffraction through a non-quiescent background medium is presented using both experimental and numerical techniques. Unlike diffracting shocks in quiescent media, a spatial distortion of the shock front occurs, pr…
View article: A Gauss/anti-Gauss quadrature method of moments applied to population balance equations with turbulence-induced nonlinear phase-space diffusion
A Gauss/anti-Gauss quadrature method of moments applied to population balance equations with turbulence-induced nonlinear phase-space diffusion Open
Many particulate systems occurring in nature and technology are adequately described by a number density function (NDF). The numerical solution of the corresponding population balance equation (PBE) is typically accompanied by high computa…
View article: Pressure Coupling Of the Spherical Linear Eddy Model to RANS-CFDfor Internal-Combustion Engine Simulation.
Pressure Coupling Of the Spherical Linear Eddy Model to RANS-CFDfor Internal-Combustion Engine Simulation. Open
As a result of the increase of the use of combustion engines, more restrictive emission standards are applied. New combustion technologies are being constantly developed to enhance the internal combustion engine, this is motivated by overc…
View article: On Spray Modeling with Quadrature‐Based Moment Methods
On Spray Modeling with Quadrature‐Based Moment Methods Open
Spray modeling requires a proper representation of the dispersed phase and involves models for a variety of physical phenomena. On the population scale, a properly formulated population balance equation provides a complete statistical desc…
View article: Turbulence modulation in particle-laden stationary homogeneous shear turbulence using one-dimensional turbulence
Turbulence modulation in particle-laden stationary homogeneous shear turbulence using one-dimensional turbulence Open
Turbulence modulation in particle-laden stationary homogeneous shear turbulence (HST) is investigated using one-dimensional turbulence (ODT), a low-dimensional stochastic flow simulation model. For this purpose, an ODT formulation previous…
View article: Large-Eddy Simulation Study of Ultra-High Fuel Injection Pressure on Gasoline Sprays
Large-Eddy Simulation Study of Ultra-High Fuel Injection Pressure on Gasoline Sprays Open
The development of gasoline spray at ultra-high injection pressures was analyzed using Large-Eddy simulation (LES). Two different nozzle hole geometries, divergent and convergent shape, were considered to inject the fuel at injection press…
View article: Turbulence modulation in particle-laden stationary homogeneous isotropic turbulence using one-dimensional turbulence
Turbulence modulation in particle-laden stationary homogeneous isotropic turbulence using one-dimensional turbulence Open
Turbulence modulation in particle-laden stationary homogeneous isotropic turbulence is investigated using one-dimensional turbulence (ODT), a low-dimensional stochastic flow simulation model. For this purpose, ODT is extended in two ways. …
View article: Evaluation of thermal barrier coatings and surface roughness in a single-cylinder light-duty diesel engine
Evaluation of thermal barrier coatings and surface roughness in a single-cylinder light-duty diesel engine Open
The effect of two thermal barrier coatings and their surface roughness on heat transfer, combustion, and emissions has been investigated in a single-cylinder light-duty diesel engine. The evaluated thermal barrier coating materials were pl…
View article: Subgrid Reaction-Diffusion Closure for Large Eddy Simulations Using the Linear-Eddy Model
Subgrid Reaction-Diffusion Closure for Large Eddy Simulations Using the Linear-Eddy Model Open
Turbulent combustion models approximate the interaction between turbulence, molecular transport and chemical reactions. Among the many available turbulent combustion models, the present focus is the linear-eddy model (LEM) used as a subgri…
View article: Numerical studies of turbulent particle-laden jets using spatial approach of one-dimensional turbulence
Numerical studies of turbulent particle-laden jets using spatial approach of one-dimensional turbulence Open
To challenge one of the major problems for multiphase flow simulations, namely computational costs, a dimension-reduced model is used with the goal to predict these types of flow more efficiently. One-dimensional turbulence (ODT) is a stoc…
View article: Modeling n-dodecane Spray Combustion with a Representative Interactive Linear Eddy Model
Modeling n-dodecane Spray Combustion with a Representative Interactive Linear Eddy Model Open
Many new combustion concepts are currently being investigated to further improve engines in terms of both efficiency and emissions. Examples include homogeneous charge compression ignition (HCCI), lean stratified premixed combustion, strat…
View article: Sensitivity of VOF simulations of the liquid jet breakup to physical and numerical parameters
Sensitivity of VOF simulations of the liquid jet breakup to physical and numerical parameters Open
In this paper the characteristics of the primary breakup of a liquid jet is analyzed numerically. We applied the Volumes of Fluids (VOF) approach utilizing the Direction Averaged Curvature (DAC) model, to estimate the interface curvature, …
View article: A Representative Interactive Linear Eddy Model (RILEM) for Non-Premixed Combustion
A Representative Interactive Linear Eddy Model (RILEM) for Non-Premixed Combustion Open
To further improve the efficiency and emissions profiles of internal combustion engines, many new combustion concepts are currently being investigated. Examples include homogeneous charge compression ignition (HCCI), stratified charge comp…
View article: RANS predictions of turbulent diffusion flames: comparison of a reactor and a flamelet combustion model to the well stirred approach
RANS predictions of turbulent diffusion flames: comparison of a reactor and a flamelet combustion model to the well stirred approach Open
The flame stabilisation process in turbulent non-premixed flames is not fully understood and several models have been developed to describe the turbulence-chemistry interaction. This work compares the performance of the multiple Representa…