A comparative study of URANS, DDES and DES simulations of Jetstream 31 aircraft near the compressibility limit

Hrishabh Chaudhary,László Könözsy,Nicolas Ledos

doi:10.32973/jcam.2021.009

Hrishabh Chaudhary, László Könözsy + Show 1 more

Open Access

https://doi.org/10.32973/jcam.2021.009

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Abstract

This work presents a comparative study of Unsteady Reynolds–Averaged Navier–Stokes (URANS), Detached Eddy Simulations (DES) and Delayed Detached Eddy Simulations (DDES) turbulence modeling approaches by performing numerical investigation with the ANSYS-FLUENT software package on a full-scale model of the Jetstream 31 aircraft. The lift and drag coefficients obtained from different models are compared with flight test data, wind tunnel data and theoretical estimates. The different turbulence models are also compared with each other on the basis of pressure coefficient distributions and velocity fluctuations along various lines and sections of the aircraft. For the mesh and the conditions presented in this study, the DDES Spalart–Allmaras model gives the best overall results.

Highlights

For advanced unsteady turbulence modeling, computational science and high performance computing have become indispensable
Another turbulence modeling approach used in this study is Detached Eddy Simulation (DES), where the Unsteady Reynolds-Averaged Navier Stokes (URANS) approach is used in the boundary layer and Large-Eddy Simulation (LES) is used after massive separation within a single formulation
This paper presented transient simulations of a full-scale Jetstream 31 aircraft using URANS, DES and Detached Eddy Simulation (DDES) turbulence modeling approaches

Summary

Introduction

For advanced unsteady turbulence modeling, computational science and high performance computing have become indispensable. Computational Fluid Dynamics (CFD) and Finite Element Analysis (FEA) cannot fully replace the experimental testing, it can undoubtedly expedite and complement the experimental results if done with the proper knowledge. Due to the advancements in the performance of the Graphics Processing Unit (GPU) and Central Processing Unit (CPU) performances, it is possible to perform the transient simulations on a full-scale model of an aircraft using the turbulence technique of Detached Eddy Simulation (DES) and Delayed Detached Eddy Simulation (DDES) in a relatively short time. The results from Unsteady Reynolds-Averaged Navier Stokes (URANS), DES and DDES simulations over Jetstream 31 aircraft are compared with the flight test data and wind tunnel results

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Results

Conclusion