NDLI: Assessment of Predictive Capabilities of Detached Eddy Simulation to Simulate Flow and Mass Transport Past Open Cavities

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Chang, Kyoungsik Constantinescu, George Seung-O Park
Copyright Year	2007
Abstract	The three-dimensional (3D) incompressible flow past an open cavity in a channel is predicted using the Spalart–Almaras (SA) and the shear-stress-transport model (SST) based versions of detached eddy simulation (DES). The flow upstream of the cavity is fully turbulent. In the baseline case the length to depth (L∕D) ratio of the cavity is 2 and the Reynolds number ReD=3360. Unsteady RANS (URANS ) is performed to better estimate the performance of DES using the same code and meshes employed in DES. The capabilities of DES and URANS to predict the mean flow, velocity spectra, Reynolds stresses, and the temporal decay of the mass of a passive contaminant introduced instantaneously inside the cavity are assessed based on comparisons with results from a well resolved large eddy simulation (LES) simulation of the same flow conducted on a very fine mesh and with experimental data. It is found that the SA-DES simulation with turbulent fluctuations at the inlet gives the best overall predictions for the flow statistics and mass exchange coefficient characterizing the decay of scalar mass inside the cavity. The presence of inflow fluctuations in DES is found to break the large coherence of the vortices shed in the separated shear layer that are present in the simulations with steady inflow conditions and to generate a wider range of 3D eddies inside the cavity, similar to LES. The predictions of the mean velocity field from URANS and DES are similar. However, URANS predictions show poorer agreement with LES and experiment compared to DES for the turbulence quantities. Additionally, simulations with a higher Reynolds number (ReD=33,600) and with a larger length to depth ratio (L∕D=4) are conducted to study the changes in the flow and shear-layer characteristics, and their influence on the ejection of the passive contaminant from the cavity.
Starting Page	1372
Ending Page	1383
Page Count	12
File Format	PDF
ISSN	00982202
e-ISSN	1528901X
Journal	Journal of Fluids Engineering
Volume Number	129
Issue Number	11
DOI	10.1115/1.2786529
Language	English
Publisher	The American Society of Mechanical Engineers
Publisher Date	2007-06-05
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cavities Eddies (Fluid dynamics) Engineering simulation Flow (Dynamics) Fluctuations (Physics) Inflow Reynolds number Reynolds-averaged Navier–Stokes equations Shear (Mechanics) Turbulence
Content Type	Text
Resource Type	Article
Subject	Mechanical Engineering

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