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Course on advanced turbulence and transition modelling: RANS, LES and laminar-to-turbulent transition models, Jun 2019, Poland

Posted By: Wojciech Regulski
Date:Thu, 2 May 2019, 5:41 p.m.

Poland, June 27, 2019

The course introduces several advanced turbulence modeling topics.
First one refers to the strengths and limitations of the RANS
modeling. This is followed by the discussion of the Large Eddy
Simulation (LES) with strong focus on the evaluation of the quality of
the results. Finally, the laminar-to-turbulent transition models
(including those present in the commercial solvers) are discussed. As
a bonus, the lattice Boltzmann method with the implicit-LES model is



This 2-day course is intended for engineers whose work
concerns CFD modelling of turbulent flows and convective
heat transfer. The course aims to imbue the participants
with a thorough understanding of eddy-viscosity based
RANS models, RANS-based laminar-to-turbulent transition
models, and LES approaches. A detailed explanation of
RANS-based techniques will be given with emphasis on the
interpretation of the results. Limitations and advantages
of RANS-based strategies will be discussed. An
explanation of the influence of inlet boundary conditions
for modelled scalars will be provided; cases in which
RANS models exhibit a strong sensitivity to the
prescribed inlet values of the modelled variables will be

The second part of the course is meant to address the
deficiencies of RANS models. Examples of applications of
the Large Eddy Simulation (implicit LES or quasi-Direct
Numerical Simulation, DNS) and the increasingly popular
lattice Boltzmann methods will be given. We will provide
the theoretical background and discuss applications of
LES for massively separated flows, where the use of
standard RANS models might lead to significant errors. We
will teach how to evaluate the quality of a LES solution
using two-point and autocorrelations and how to estimate
the required mesh cell and time step sizes to resolve the
turbulence statistics with sufficient accuracy.

The last part of the course will focus on modelling the
laminar-to-turbulent transition of a flow. We will
explain the physics of natural, bypass, and separated
flow transitions and describe the most popular transition
models (available in many commercial CFD packages).
Finally, we will show and discuss the results of
transition simulations and compare them with experiments,
DNS, and results obtained using fully-turbulent RANS

The lectures will consist of theoretical background on
each of the topics and will be illustrated with
simulation results. Limitations and advantages of various
turbulence modelling and convective heat transfer
modelling strategies will be discussed. It will be
demonstrated how to overcome or mitigate turbulent flow
and heat transfer modelling errors by proper selection of
closure strategies.

The lecturer of the course is Dr SÅ‚awomir Kubacki (Dr-
habil.), a former co-worker of Dr Florian Menter, and an
author of the laminar-to-turbulent transition models for
turbomachniery flows.

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