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1 Research Bulletin / Warsaw University of Technology, Institute of Aeronautics and Applied Mechanics
1 TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2 Sillen M.

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Turbulent flow modelling using EARSM on parallel computers

Sillen M.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2001

Vol. 5, No 2

247-260

The compressible Navier-Stokes equations are solved numerically for turbulent transonic aerospace applications on parallel computers. The turbulence is modelled by an Explicit Algebraic Reynolds Stress Model (EARSM). Expressing the EARSM as an extension of an eddy-viscosity model makes the implementation straightforward in a flow solver with existing two-equation eddy-viscosity models. The k-w transport equations are used as a platform for the model. The EARSM approach significantly improves the shock position for transonic flow over wings without substantial increase in computational cost. Industrial use of advanced flow modelling requires a short turn-around time of computations. This is enabled through the use of parallel computers. To achieve good parallel performance the computational load has to be evenly distributed between the processors of the parallel machine. A heuristic algorithm is described for distributing and splitting the blocks of a structured multiblock grid for a good static load balance. Speed-up results are presented for turbulent flow around a wing on a number of parallel platforms.

Advanced flow simulation methods in aircraft design

Sillen M.

Research Bulletin / Warsaw University of Technology, Institute of Aeronautics and Applied Mechanics

2000

nr 10

183-190

Computational Fluid Dynamics is an important tool in the aerodynamic design and analysis process. The continuous increase in computer speed and algorithm efficiency offers the aerospace industry a possibility to deploy increasingly more advanced numerical methods early in the design process. The flow modelling methods at Saab Aerospace have been developed to meet the requirements of short tum'around'time problem and advanced physical of viscous flow for applications in the aerospace field. The presented improvements focus on two main aspects, the efficient use of parallel computers and turbulence modelling. A load balancing method is described how to partition a structured multi-block grid for efficient use of parallel computers. The prevailing turbulence models employed In the design process in the aerospace industry today range from simple algebraic models through to linear eddy viscosity models. Initial at Saab Aerospace using an Explicit Algebraic Reynolds Stress Model (EARSM) on the k-o) transport equations is presented. A non-linear stress/strain relationship in the EARSM offers improved physical modelling of turbulent flow. A number of viscous flow examples on complex configurations, including a complete aircraft are presented in the paper.