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Job Record #15650
TitlePh.D. in CFD
CategoryPhD Studentship
EmployerBTU Cottbus-Senftenberg
LocationGermany, Brandenburg, Cottbus
InternationalYes, international applications are welcome
Closure DateTuesday, April 30, 2019
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.
Only via email using only one pdf document. 

[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.

Contact Information:
Please mention the CFD Jobs Database, record #15650 when responding to this ad.
NameRecruitment Manager
Email ApplicationYes
Record Data:
Last Modified06:05:55, Monday, April 15, 2019

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