eddy viscosity model

eddy viscosity model

[′ed·ē vi′skäs·əd·ē ‚mäd·əl]
(fluid mechanics)
A model of the Reynolds stresses in turbulent flow which is based on the idea that turbulent mixing, analogous to molecular mixing, is governed by an effective viscosity (the eddy viscosity) which is not a property of the fluid but a consequence of the local state of turbulence.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Taking consideration of local eddy-viscosity and near wall behaviours, the wall-adapting local eddy viscosity model is used.
[13.] Shih, T.-H., "Anew k - [member of] eddy viscosity model for high reynolds number turbulent flows," Computers & Fluids 24(3):227-238, 1995, doi:http://dx.doi.org/10.1016/0045-7930(94)0032-T.
Classical turbulence models based on the Reynolds decomposition (RANS) with an eddy viscosity model lead to a calculated turbulent viscosity up to a hundred times higher than that suitable for resolving turbulent structures important for detailed in-cylinder flow analyses [6].
[19.] Germano, M., Piomelli, U., Moin, P., and Cabot, W.H., "A dynamic subgrid-scale eddy viscosity model," Physics of Fluids A3, 1760 (1991), doi:10.1063/l.857955.
The most simple and basic model in Reynolds stress modeling -<[u'.sub.i][u'.sub.j]> is the eddy viscosity model. In analogy with the interaction formula for the shearing stress and velocity gradient generated by a coefficient of kinematic viscosity v, eddy viscosity coefficient [v.sub.t], and the Reynolds stress -<[u'.sub.i][u'.sub.j]> in relation to an average velocity gradient and [v.sub.t],
The eddy viscosity [v.sub.t] is computed using simple mixing-length eddy viscosity model with near-wall damping in Wang and Moin [30] as follows:
A dynamic subgrid-scale eddy viscosity model. Proceedings of the 1990 Summer Program, Standford University, Stanford, CA, pp.
(4) eddy viscosity model: [[tau].sub.ij] - 1/3 [[delta].sub.ij][[tau].sub.kk] = -2C[[DELTA].sup.2]|[bar.S]|[[bar.S].sub.ij]
New turbulence models are added in this upgraded version, including a large eddy simulation and a nonlinear eddy viscosity model. The postprocessing procedure has been enhanced, according to the developer, to provide a reduction in numerical processing times.
A dynamic subgrid scale eddy viscosity model. Physics of Fluids A: Fluid Dynamics (1989-1993), 3(7):1760-1765, 1991.
A dynamic subgrid-scale eddy viscosity model. Physics of Fluids 3: 1760-1765.