Numerical Investigation on the Salient Features of Flow over Standard Notchback Configurations using Scale Resolving Simulations

CHODE, K.K., VISWANATHAN, Harish and CHOW, K. (2020). Numerical Investigation on the Salient Features of Flow over Standard Notchback Configurations using Scale Resolving Simulations. Computers & Fluids, 210, p. 104666.

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    We present a detailed numerical investigation on the salient features of flow over an SAE reference body with several backlight angles representing a standard notchback geometry using Scale Resolving Simulations (SRS) such as the SBES and the SDES. A grid evaluation study is performed for the SAE Notchback geometry with 20° backlight angle with a Reynolds number (Re) of 6.57 × 105 based on the height of the body. Various aerodynamic parameters and flow structures are compared against the previously published experimental results to evaluate the performance of the numerical predictions and against the unsteady k – ω SST model. Both SBES and SDES models agree well with the previously published wind tunnel results, exhibit a well-preserved modelled RANS layer, and numerically show negligible differences between them. However, the transition from RANS to LES in the separated shear layer (SSL) appears to be marginally robust with SBES. Our numerical results demonstrate that with the increases in the backlight angle, the strength of trailing vortex tends to reduce on one side compensated by an increase on the other side of the model. As a consequence, the SSL shows a non-symmetrical flow feature behind the vehicle for the backlight angles of 30° and 40° as detailed in the experimental result and suitably predicted by the numerical results. We highlight that within the scope of this study, both the SRS models have shown to be accurate and reliable in predicting the aerodynamic force coefficients flow features observed in experiments.

    Item Type: Article
    Additional Information: ** Article version: AM ** Embargo end date: 31-12-9999 ** From Elsevier via Jisc Publications Router ** Licence for AM version of this article: This article is under embargo with an end date yet to be finalised. **Journal IDs: issn 00457930 **History: issue date 08-07-2020; accepted 06-07-2020
    Identification Number:
    Page Range: p. 104666
    SWORD Depositor: Colin Knott
    Depositing User: Colin Knott
    Date Deposited: 15 Jul 2020 11:41
    Last Modified: 08 Jul 2021 01:18

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