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Acceleration-driven variable-density turbulent flow

Gat, Ilana and Matheou, Georgios and Chung, Daniel and Dimotakis, Paul E. (2016) Acceleration-driven variable-density turbulent flow. In: VIIIth International Symposium on Stratified Flows (ISSF), August 29 - September 1, 2016, San Diego, CA.

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We discuss turbulent dynamics and mixing of a variable-density flow subject to a uniform-acceleration field. The flow and misalignments of pressure and density gradients are investigated for small to large density ratios, with evidence that the small-density ratio flow is described by the Boussinesq approximation. A new shear-layer growth rate is reported, along with an extension of uniform-density flow vorticity-alignment statistics in the variable-density ow studied. Spectra collapse when properly scaled for variable density.

Item Type:Conference or Workshop Item (Paper)
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URLURL TypeDescription
Gat, Ilana0000-0003-0223-0507
Matheou, Georgios0000-0003-4024-4571
Chung, Daniel0000-0003-3732-364X
Additional Information:The work is supported by DOE Grant DE-NA0002382, AFOSR Grant FA9550-12-1-0461, NSF GRFP under Grant DGE-1144469, Caltech, and Blue Waters PRAC, supported by NSF OCI-0725070 and ACI-1238993, and Illinois. Data-storage/-visualization computer cluster, integrated by Daniel Lang and developed with support by NSF MRI Grant EIA-0079871, is used. Computations are also performed on the Caltech Zwicky computer cluster, supported by NSF MRI-R2 PHY-0960291 and by the Sherman Fairchild Foundation. The work was also supported by the Cray Trinity system of ACES, a partnership between LANL and SNL for the U.S. DOE's NNSA. We would like to acknowledge discussions with Profs. Dan Meiron and Dale Pullin, and the collaboration with Prof. Christian Ott in the computations. Note: An error was noted in the alignment statistics of vorticity and baroclinic torques in the originally posted paper and conference presentation. The present typescript is an update without the corresponding sections. The authors regret the original error.
Funding AgencyGrant Number
Department of Energy (DOE)DE-NA0002382
Air Force Office of Scientific Research (AFOSR)FA9550-12-1-0461
NSF Graduate Research FellowshipDGE-1144469
Sherman Fairchild FoundationUNSPECIFIED
Record Number:CaltechAUTHORS:20160915-111630955
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:70375
Deposited On:15 Sep 2016 19:14
Last Modified:21 Feb 2023 23:50

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