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Postdoc on Advanced Immersed boundary Method (IBM) tools for the analysis of wall-bounded turbulent flows using OpenFOAM, PPrime, R.Tech, Poitiers (France)

Du 1 mai 2021 au 31 mai 2023

The proposed contract is for a duration of 24 months with a scheduled start date for May-June 2021. Some flexibility for the latter can be granted depending on the availability of the candidate.

R.Tech, Verniolle (80%) and Pprime Institute-ENSMA, Poitiers (20%). The candidate will be mainly based in Verniolle and regular visits to the team at ENSMA, Poitiers, will be organized.

Contact :
E. Constant (eddy.constant@rtech.fr)
M. Meldi (marcello.meldi@ensma.fr)


The present research work aims for improving the analysis of complex flow configurations which are observed for space launchers and space vehicles using numerical tools.

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Postdoc fellowship Pprime – R.Tech

Advanced Immersed boundary Method (IBM) tools for the analysis of wall-bounded turbulent flows using OpenFOAM

Host Partners: R.Tech, Verniolle (80%) and Pprime Institute-ENSMA, Poitiers (20%). The candidate will be mainly based in Verniolle and regular visits to the team at ENSMA, Poitiers, will be organized.

Scientific Leaders: E. Constant (eddy.constant@rtech.fr), M. Meldi (marcello.meldi@ensma.fr)

Candidates profile: the candidate must have strong competences in the numerical simulation of turbulent flows. A PhD degree in this area of expertise is required. Previous experience using IBM tools and / or OpenFOAM is also welcome.

Eligibility: the candidate must be a French national citizen with a PhD and / or he (she) will have obtained his (her) PhD at a French Institution. In any case, the PhD diploma must have been delivered during the school years 2019-2020 or 2020-2021. These eligibility criteria are compulsory. Every candidature not complying with these criteria will be automatically discarded and no feedback will be provided.

Subject: the present research work aims for improving the analysis of complex flow configurations which are observed for space launchers and space vehicles using numerical tools. For these flows, the accurate prediction of several aspects such as shock waves, heat transfer, turbulence and surface deterioration are crucial because of the emergence of strong non-linear interactions. Owing to the high Reynolds number of such flows and the geometric complexity investigated, direct calculation of all dynamic scales of the flow cannot be achieved with present computational means and the development of efficient modelling strategies is the only practical option available. In addition, taking into account the movement of the immersed body using classical body-fitted approaches may result in prohibitive computational resources. This project targets improvement in the analysis of the physical objectives previously presented via the advancement of the library CYCLONE developed by the industrial partner R.Tech, which will be enhanced including physical models developed at Pprime Institute. The library CYCLONE allows for the representation of immersed bodies using the immersed boundary method (IBM)[1-3]. The IBM is a well- known technique used to model the presence of the immersed body inside the flow. One of the main advantages of this family of tools is that they rely on simplified / cartesian meshes, which allow to minimize the numerical error associated with highly deformed mesh elements usually produced by body- fitted procedures around complex geometries. A second advantage is that the flow representation and body movement can be accounted for with very limited increase in computational resources.

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Objectives: the work of the candidate will aim for the development of three synergic tasks, which are listed in the following:

  1. Implementation of an interface allowing to perform an optimized connection between the library CYCLONE and the opensource code OpenFOAM [4].

  2. Development of several physical models within the library, which aim to improve the accuracy of the near-wall prediction of the flow. These models will mainly act as wall functions for the representation of wall turbulence with heat transfer, to be integrated in the IBM formalism.

  3. Validation of the models developed with application to test cases of increasing complexity.

Duration of the contract and start date: the proposed contract is for a duration of 24 months with a scheduled start date for May-June 2021. Some flexibility for the latter can be granted depending on the availability of the candidate.

References

  1. A. Pinelli, I. Naqavi, U. Piomelli et J. Favier, «Immersed Boundary Method for generalised Finite Volume and finite Difference Navier-Stokes Solvers.,» Journal of Computational Physics, vol. 229, pp. 9073-9091, 2010.

  2. E. Constant, J. Favier, M. Meldi, P. Meliga et E. Serre, «An immersed boundary method in OpenFOAM : Verification and validation,» Computers & Fluids, vol. 157, pp. 55-72, 2017.

  3. H. Riahi, M. Meldi, J. Favier, E. Serre et E. Goncalves, «A pressure-corrected Immersed Boundary Method for the numerical simulation of compressible flows,» Journal of Computational Physics, vol. 374, pp. 361-383, 2018.

  4. www.openfoam.com