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- Krajnovic, Sinisa, 1970, et al.
(författare)
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LES INVESTIGATION OF THE ASYMMETRY IN THE WAKE OF A GENERIC VEHICLE BODY
- 2013
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Ingår i: 4th International Conference on Jets, Wakes and Separated Flows, ICJWSF2013 IMECE 2013 September 17-21, 2013, Nagoya, JAPAN.
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Konferensbidrag (refereegranskat)abstract
- Large eddy simulations are used to investigate the emergence of flow asymmetry behind the symmetric geometry of a simplified notchback vehicle body. Two different angles of the backlight were simulated, resulting in asymmetric and symmetric flows in agreement with previous experimental observations. Simulations were made at Reynolds numbers 10^4, 3 x 10^4 and 5 x 10^4 based on the incoming velocity and the height of the body. The Reynolds number dependency of the asymmetry phenomenon was observed when the Reynolds number was changed from 10^4 to 3 x 10^4. The LES results are used to present a new picture of the time-averaged flow around the notchback geometry. The instantaneous flow was found to contain regular shedding of the horse-shoe vortices from the deck at the nondimensional frequency of St=0.42, in agreement with previous experimental observations.
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| 4. |
- Krajnovic, Sinisa, 1970, et al.
(författare)
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The status of PANS for bluff body aerodynamics of engineering relevance.
- 2014
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Ingår i: In 5th Symposium on Hybrid RANS-LES Methods, TEXAS, A&M University, College Station, Houston, USA, 19-21 March, 2014.
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Konferensbidrag (refereegranskat)abstract
- This paper is a review of the use of Partially-Averaged Navier-Stokes (PANS) simulations for various bluff body flows of engineering relevance. The application range from flows around generic bluff bodies such as a finite cylinder to flows around simplified road vehicle, trains and landing gears. Active flow control of bluff body flow is one of important application of PANS discussed in this paper. Judgment of the PANS performance is made in comparison with LES and other numerical techniques such as DES and RANS. The review illustrates the success of PANS and its advantage over LES in several bluff body flow, such as the flow around a rudimentary landing gear and the flow around finite cylinder. It also shows that there is a need of improvement in existing PANS methodology with variable $f_k$ in flows with varying boundary conditions.
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