CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Jobs > Job Record #15650

CFD Jobs Database - Job Record #15650

Job Record #15650
TitlePh.D. in CFD
CategoryPhD Studentship
EmployerBTU Cottbus-Senftenberg
LocationGermany, Brandenburg, Cottbus
InternationalYes, international applications are welcome
Closure DateFriday, March 01, 2019
Description:
Title: Stochastic simulation and time series analysis of nocturnal atmospheric boundary layers


Scientific field: Meteorology, Mechanical Engineering, Applied, Mathematics, Computational Fluid Dynamics
Key words: CFD, Boundary layers, Atmosphere, Time Series Analysis


Scientific Context:
Even stable stratifications can get locally (in space and time) unstable due to forcing from sub-mesoscale 
motion. The correlation of the forcing and the generated turbulence is observed in field studies, but not fully 
understood from a theoretical point of view. Just adapting existing similarity theory does not seem useful and 
thus developing a stochastic parameterization for sub-mesoscale motions or their effect on turbulence could 
represent an appropriate solution. 


Research subject:
In this project the expertise of (i) flow modeling via recent stochastic approaches like ODTLES (on one-
dimensional turbulence (ODT) based large eddy simulationen (LES)) and (ii) mathematical time series analysis 
shall be combined in an interdisciplinary fashion to investigate the former mentioned correlations in a broad 
parameter space.

The first objective will be to apply an existing stand-alone ODT code (C++) to Ekman flows. ODT velocity and 
buoyancy statistics will be compared with available reference data. The neutrally stratified case is considered 
for various Reynolds numbers for validation of the lower-order formulation. After that we move on to the 
stably-stratified cases for varying Richardson and Prandtl numbers. Some of the computations will be 
repeated with ODTLES.  

As a second objective, ODT and ODTLES are used to numerically study the nocturnal boundary layer. 
Stratification and types of forcing are varied in a systematic way.

The third objective is the data analysis which will be done in cooperation with colleagues from FU Berlin.


Duration and Payment:
The project duration is 36 months. You will be paid in form of a tax free stipend. The amount is at least of the 
order of DFG Ph.D. stipends, but might be higher depending on the qualification of the candidate.
  
Application:
Only via email using only one pdf document. 

References:
[1] Vercauteren, N., Mahrt, L., and Klein, R. (2016). Investigation of interactions between scales of motion in 
the stable boundary layer. Quarterly Journal of the Royal Meteorological Society 142:2424–2433.

[2] Vercauteren, N. and Klein, R. (2015). A clustering method to characterize intermittent bursts of turbulence 
and interaction with submeso motions in the stable boundary layer. J. Atmos. Sci., 72:1504–1517

[3] Kang, Y and Belusic, D and Smith-Miles, Kate. (2015) Classes of structures in the stable atmospheric 
boundary layer. Quarterly Journal of the Royal Meteorological Society 141:2057–2069.

[4] Glawe C, Medina M. JA, Schmidt H. IMEX based multi‐scale time advancement in ODTLES. Z Angew Math 
Mech. 2018;98:1907–1923. https://doi.org/10.1002/zamm.201800098

Contact Information:
Please mention the CFD Jobs Database, record #15650 when responding to this ad.
NameRecruitment Manager
Emailheischmi@zedat.fu-berlin.de
Email ApplicationYes
URLhttps://www.b-tu.de/fg-stroemungsmodellierung/
Record Data:
Last Modified13:39:57, Friday, February 15, 2019

[Tell a Friend About this Job Advertisement]

Go to top Go to top