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Postdoc Position, Scientific Computing, Brazil

Post-doc Position in Scientific Computing - Brazil

The Center for Mathematical Sciences Applied to Industry (CEPID-
CeMEAI) has a post-doc position available for starting immediately.
The requirements for the position are described below. The salary is
R$5908,00 (USD 2500,00) per month tax free. The appointed Post- doc
will also get return travel from his/her country to Brazil paid by the
grant.  CeMEAI is a consortium of several Universities in São Paulo
State.  The position is initially for one year, renewable for a second
year pending on suitable performance.

Post-Doctoral Research Project
Aerodynamics Division - Instituto de Aeronautica e Espaço -
DCTA/IAE/ALA

Location: São José dos Campos – São Paulo State- Brazil

Title: Large Eddy Simulations and Aeroacoustics of Perfectly
Expanded Supersonic Jets
Supervisor: João Luiz F. Azevedo

Job Description/Requirements: The main objective of the present
research work is to study and develop a numerical methodology for the
prediction of acoustic propagation and radiation due to the
interaction of exhaust gases from rocket engines with the ambient air,
under perfectly expanded supersonic jet conditions. In general,
supersonic jet noise generation has three main mechanisms: (1) noise
due to turbulent mixture processes; (2) noise due to shock waves; and
(3) well-defined tonal noise or screech noise. In the present work,
since perfectly expanded jets are being considered, mechanisms (2) and
(3) can be neglected. Therefore, only the first mechanism will be
considered. It is commonly accepted that the mechanism of noise
emission of type (1) can adequately be described by hydrodynamic
instability theory, in which one can assume a slow evolution of the
mixing layer.

The present work will use hybrid methods in order to handle the
problem of interest. Hybrid methods compute sound generation and
propagation separately. Typically, computational fluid dynamics (CFD)
techniques are used to calculate the flow variables in the region
where the nonlinear acoustic sources are located. Such flow variables
are, then, used as initial data for sound propagation formulations
which will yield the noise levels at distant observers. Clearly, the
flow physical characteristics must be accurately captured by the CFD
method in order to use hybrid methods. Moreover, the turbulent
aerodynamic flows considered in the present work yield acoustic
sources in a broad regime of frequencies and spatial
scales. Therefore, large eddy simulation (LES) is the method of choice
for the calculation of the flows of interest, since this formulation
can capture the most energetic scales associated with noise
generation. The acoustic analogy formulation of Ffowcs Williams and
Hawkings (FWH) will be used for the acoustic calculations of sound
radiation due to the supersonic jet flows of interest.

Candidates must hold a doctoral degree in Aerospace or Mechanical
Engineering, or in a related area, with demonstrated experience in the
calculation of turbulent flows and/or aeroacoustics. They should
submit a comprehensive CV, which indicates their previous experience
especially as it relates to the subject matter of the present
proposal.

Interested candidates should e-mail a CV and two letters of
recommendation from university professors as soon as possible to:

Dr. João Luiz F. Azevedo
Aerodynamics Division
Instituto de Aeronáutica e Espaço
DCTA/IAE/ALA
12228-903 – São José dos Campos – SP – Brazil
E-mail: joaoluiz.azevedo@gmail.com
Office Phone No.: +55-12-3947-6488

Contract Condition: Grant from FAPESP under the Research,
Innovation and Dissemination Centers (RIDC-CeMEAI)
(http://www.fapesp.br/en/17,http://www.cemeai.icmc.usp.br/ )

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