
Elias TrautnerUniversity of the Bundeswehr Munich · Applied Mathematics and Scientific Computing
Elias Trautner
Master of Science
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24
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Introduction
Publications
Publications (24)
This study is concerned with Large Eddy Simulation of liquid jet atomization using a two-way coupled Eulerian-Lagrangian multiscale approach. The proposed framework combines Volume-of-Fluid interface capturing with Lagrangian Particle Tracking. The former is used to compute the core jet and large liquid elements in the near-nozzle region, whereas t...
Using direct numerical simulation, the primary atomization of shear-thinning liquid jets into stagnant gas is investigated. Starting from a Newtonian configuration with material properties approximately corresponding to a Diesel injection, two hypothetical shear-thinning cases using the power-law and the Carreau-Yasuda models for the calculation of...
This study proposes two different strategies to enforce accurate volume conservation in volume‐of‐fluid (VOF)‐based simulations of turbulent bubble‐laden flows on coarse grids. It is demonstrated that, without a correction, minimal volume errors on a time‐step level, caused by the under‐resolution of the interface, can accumulate to significant dev...
Turbulent bubble-laden flows are an integral part of numerous technical applications. Due to the computational cost of Direct Numerical Simulation, Large Eddy Simulation (LES) comes into focus for the design of such devices. One of the central challenges for two-phase LES is the under-resolution of the interface dynamics, which leads to a variety o...
Emulsions are suspensions of immiscible liquids, in which the dispersed liquid is present in the carrier liquid in the form of poly-disperse droplets. In order to obtain and maintain an emulsion, a constant energy input in the form of kinetic energy is required to deform and break up droplets. Both processes increase the total droplet surface area,...
Using direct numerical simulation (DNS), the primary atomization of liquid jets into stagnant gas is investigated. The fluid properties correspond to a Diesel injection. The effect of nozzle inflow particularly on the primary atomization process is studied by varying the turbulence intensity u′/U_0 and the integral turbulent length scale L_t. Three...
Gas-liquid two-phase flow is a critical component of many industrial processes, including air lift pumps in the oil industry, chemical reactors in the process industry, and nuclear reactors in the power industry. Preventing the release of radioactive particles in the form of aerosols is of paramount importance in the event of a nuclear accident. To...
Using direct numerical simulation (DNS) in combination with the volume of fluid method (VoF), we investigate the influence of the density ratio between the carrier and dispersed phase on emulsions, where the baseline simulation approximately corresponds to the ratio of water-in-gasoline emulsions. For this purpose, homogeneous isotropic turbulence...
We study the segregation of emulsions in decaying turbulence using direct numerical simulations in combination with the volume of fluid method. To this end, we generate emulsions in forced homogeneous isotropic turbulence and then turn the forcing off and activate the gravitational acceleration. This allows us to study the segregation process in de...
We study the segregation of emulsions in decaying turbulence using direct numerical simulations (DNS) in combination with the volume of fluid method (VOF). To this end, we generate emulsions in forced homogeneous isotropic turbulence and then turn the forcing off and activate gravitational acceleration. This allows us to study the segregation proce...
We study turbulent emulsions and the emulsification process in homogeneous isotropic turbulence (HIT) using direct numerical simulations (DNS) in combination with the volume of fluid method (VOF). For generating a turbulent flow field, we employ a linear forcing approach augmented by a proportional‐integral‐derivative (PID) controller, which ensure...
Numerical simulations of turbulent reacting flows using detailed chemistry mechanisms require a significant computational power, especially if hydrocarbons are involved. Although pre-tabulated chemistry databases are commoly used to speed-up the computation, they can require a large memory footprint. In this work, flamelet tables are replaced by de...
The influence of non-Newtonian fluid behavior and the Eötvös number on conditional and unconditional second-order structure functions of bubbly channel flows has been investigated by conducting a series of direct numerical simulations at a friction Reynolds number of 127.3. Two Eötvös numbers have been considered (Eo = 0.3125 and Eo = 3.75) togethe...
The influence of non-Newtonian fluid behavior on the flow statistics of turbulent bubble-laden downflow in a vertical channel is investigated. A Direct Numerical Simulation (DNS) study is conducted for power-law fluids with power-law indexes of 0.7 (shear-thinning), 1 (Newtonian) and 1.3 (shear-thickening) in the liquid phase at a gas volume fracti...