DLR

DLR

PhD Position: Investigation of transport and dispersion characteristics of aerosol particles in closed and populated rooms

Place: DLR, Institute of Aerodynamics and Flow Technology, Göttingen

Contact: Andreas.SchroedernoSp@m@dlr.de

Duration: 3 Years

Starting date: as soon as possible

Expressions of interest are sought for an exceptional PhD candidate to conduct fundamental research on the topic of transport, dispersion and accumulation characteristics of aerosol particles in closed and populated rooms using the advanced 3D Lagrangian particle tracking method Shake-The-Box (STB) in the frame of the interdisciplinary research project CORAERO  funded by the German Helmholtz society (HGF).

The PhD candidate will conduct:

  • preparation and set-up of a generic seminar room with good optical access for experimental investigations of internal flows
  • set-up and application of a 3D LPT measurement system using high resolution streaming cameras, HFSBs and large arrays of pulsed LEDs
  • image processing, evaluation by STB particle tracking and subsequent FlowFit interpolation of the large-scale experimental data set using High-Performance-Computing resources
  • analysis of the fluid mechanical and transport properties of the mixed thermal convection flows by the measured 3D3C instantaneous and mean flow field data, by corresponding one- and two- point statistics of velocity, pressure and acceleration and by Lagrangian dispersion statistics.
  • investigations of coherent structures and related velocity gradients in different regions of the mixed thermal convection flows inside the test room
  • presentation of research results on international conferences and in peer reviewed journals

In that regard, a high quality and extensive experimental test campaign using the STB technique with LED illuminated Helium Filled Soap Bubbles in a large generic test room (~ 70 m³) under various conditions is planned within CORAERO. Lagrangian and Eulerian aspects of the measured internal flows with dynamic scenarios and seated thermal mannikins will be investigated and analysed statistically. The data will be provided to the project consortium and combined with further knowledge stemming from experts in the areas of bio-physics, medicine, virology and engineering in order to define appropriate measures for reducing viral loads in rooms and infection risks.

For further information please see:  https://www.dlr.de/dlr/jobs/en/desktopdefault.aspx/tabid-10596/1003_read-47364/

 

PhD Position: Numerical prediction of aerosol dynamics in passenger cabins

Place: DLR, Institute of Aerodynamics and Flow Technology, Göttingen

Contact: Prof. Dr. Claus Wagner

Duration: 3 years

Starting date: 1st September 2021

In the department of ground-based vehicles, all aspects of the aerodynamics of vehicles and their air conditioning are researched with the help of experimental and numerical methods in different working groups. The vehicle air conditioning group is concerned with efficient cabin ventilation, thermal comfort and air quality in passenger compartments as well as research into condensation processes at various points in the vehicle. The doctoral position is advertised within the framework of the interdisciplinary Helmholtz project "CORAERO", in which close networking with other research groups from Helmholtz centres is explicitly desired.

The transmission of viruses and other pathogens via aerosols has received special attention worldwide due to the recent COVID-19 pandemic. Public transport such as aeroplanes or rail vehicles have been in special focus since then. Numerical methods for the detection of aerosol dispersion and the local contamination of individual seats are currently either very time-consuming transient simulations, resort to different strong modelling degrees or can only represent steady-state conditions.

The focus of the project is the numerical prediction of the formation of aerosol droplets of different sizes during respiration and their growth or shrinkage in the course of dispersion by means of direct numerical simulations (DNS) of the transport processes in generic spaces. Based on the knowledge gained about droplet dynamics and aerosol dispersion, a modelling of droplet transport for Reynolds-averaged Navier-Stokes simulations (RANS) will be developed to realise transferability to larger passenger spaces.

For further information please see: https://www.dlr.de/dlr/jobs/desktopdefault.aspx/tabid-10596/1003_read-46482/