Direct numerical simulation of a round jet into a crossflow – analysis and required resources. (English) Zbl 1391.76212

Nagel, Wolfgang E. (ed.) et al., High performance computing in science and engineering ’07. Transactions of the High Performance Computing Center, Stuttgart (HLRS) 2007). Papers presented at 10th results and review workshop, Stuttgart, Germany, October 4–5, 2007. Berlin: Springer (ISBN 978-3-540-74738-3/hbk). 339-350 (2008).
Summary: Results from two Direct numerical simulations of a round jet in crossflow with velocity ratio of 3.3 are presented. The Reynolds number was 650 and 325. A passive scalar with Schmidt number of unity is introduced with the jet. The boundary conditions for both, jet and crossflow are laminar. This provides an unambiguous definition of the setup and favours its use as a test case. Transition of the jet was identified by an abrupt expansion of the average scalar field. The higher Reynolds number leads to a transition at 3.49 diameters downstream of the jet exit, the lower one – at 4.41 diameters. The higher Reynolds number flow exhibits smaller turbulent structures, but despite this and the different location of the transition, the trajectories of the two flows are close to each other.
The computational technique employed is a block-structured Finite-volume method with local grid refinement at block boundaries implemented in the code LESOCC2. This allowed efficient distribution of cells so that 89% of them could be clustered in the vicinity of the jet exit and in the transition region. Issues of parallelization and efficiency are addressed in the text.
For the entire collection see [Zbl 1130.76008].


76F65 Direct numerical and large eddy simulation of turbulence
76F10 Shear flows and turbulence
76M12 Finite volume methods applied to problems in fluid mechanics


Full Text: DOI


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