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Scale-Resolving Simulations Combined with the Immersed Boundary Method for Predicting Car Aerodynamics
Technical Paper
2023-01-0561
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper presents calculations of external car aerodynamics by using the Partial-Averaged Navier-Stokes (PANS) variable resolution model in conjunction with the finite volume (FV) immersed-boundary method. The work presented here is the continuation of the study reported in Basara et al. [1]. In that work, it was shown that the same accuracy of predicted aerodynamic forces can be achieved by using Reynolds-Averaged Navier-Stokes (RANS) k-ζ-f model on both types of meshes, the standard body-fitted (BF), and on the immersed boundary (IB) mesh. Due to all well-known shortcomings of the steady state approach, in this work we deal with the Partially Averaged Navier-Stokes (PANS), which belongs to the hybrid RANS-LES (scale resolving / high fidelity) methods. This approach was developed to resolve a part of the turbulence spectrum adjusting seamlessly from RANS to DNS (Direct Numerical Simulation). The PANS model variant used for the present calculations is based on the near-wall RANS k-ζ-f model. The numerical implementation of the wall treatment on the IB meshes is the same as in the previously reported RANS calculations. The significant speed-up of the PANS calculations was achieved by using the fractional step method. Comparisons of the PANS results on both types of meshes with the experimental data for the well-known DrivAer notchback model (Hupertz et al. [2]) demonstrate the predictive capability of PANS in the IB framework.
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Citation
Basara, B., Pavlovic, Z., Zunic, Z., Jemcov, A. et al., "Scale-Resolving Simulations Combined with the Immersed Boundary Method for Predicting Car Aerodynamics," SAE Technical Paper 2023-01-0561, 2023, https://doi.org/10.4271/2023-01-0561.Also In
References
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