Projects
DIMPLE
Simulation of Complex Turbulent Flows — Drag Reduction
by Dimples
Detailed numerical investigations of complex turbulent flows became
feasible by high–performance computers and advanced simulation
techniques such as direct numerical simulations (DNS), large–eddy
simulation (LES) and hybrid LES–RANS methods (e.g. DES). For that
purpose the Navier–Stokes solver LESOCC was steadily enhanced and
extended at the Institute of Fluid Mechanics (LSTM), University of Erlangen–
Nürnberg.
Presently the software package LESOCC contains the following features:
- Navier–Stokes solver for incompressible fluids based on a 3–D
finite–volume approach using block–structured, curvilinear body–
fitted grids
- Spatial discretization using five different schemes (second–order
accurate)
- Temporal discretization of second–order accuracy using a predictor–
corrector method based on a low–storage Runge–Kutta scheme
- Variety of different subgrid–scale and wall models
- Two–phase flow predictions based on an Euler–Lagrange approach
- Highly vectorized code; more than 50 % of the peak performance on
vector computers
- Parallelized by domain decomposition and explicit message passing
based on MPI
LESOCC is applied in various scientific and engineering disciplines
such as
- aerodynamics, hydrodynamics and turbulence research
- mechanical and civil engineering
- chemical and process engineering
In the framework of the present project, numerical simulations for
internal turbulent flows are carried out in order to investigate the influence
of surface structures called “dimples“ on the friction drag. Drag
reduction techniques such as riblets or polymers are known for a long
time and of huge importance for economics. The dimple technology,
however, is quite new and not understood at all. Hence, the task of the
project is to shed some light into this ascinating topic in order to clarify
the underlying physical mechanism.
Contact

Priv.–Doz. Dr.–Ing. Michael Breuer
Lehrstuhl für Strömungsmechanik,
Universität Erlangen-Nürnberg
E-Mail: breuer@lstm.uni-erlangen.de
Dipl.–Ing. Thomas Zeiser
Regionales Rechenzentrum Erlangen,
Universität Erlangen–Nürnberg
E-Mail: thomas.zeiser@rrze.uni-erlangen.de
Dr.–Ing. Peter Lammers
Höchstleistungsrechenzentrum,
Universität Stuttgart
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