Special Issue "Large Eddy Simulation and Turbulence Modeling"
Deadline for manuscript submissions: closed (15 October 2020) | Viewed by 10028
Interests: active and passive devices for flow control; computational fluid dynamics; turbulence theory; vortex dynamics and boundary layers; wind turbine rotor aerodynamics/aero-elasticity; active/passive devices for flow control; flow separation study in complex geometries; energy harvesters
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Computational power has been improved over the last few decades; therefore, complex flow modeling phenomena using computational fluid dynamics (CFD) have become more feasible. Furthermore, the improvement of computational power is expected to continue and will serve to progress in the CFD modeling capabilities.
The role of turbulence is essential to the understanding, prediction, and improvement of complex flows. In fact, turbulence is vital to the proper operation of many industrial applications. Generally, the goal of turbulence modeling is to reproduce the physics of the flow as accurately as possible with as little computational effort as possible. In some cases, turbulence is modeled by the Reynolds Averaged Navier–Stokes (RANS) methods, where the Navier–Stokes equations are ensemble averaged. This averaging results in an extra stress term, which is typically modeled with an effective turbulent viscosity. The ensemble averaging tends to remove the unsteady part of the turbulent flow. RANS models generally perform satisfactorily in less complex flows. Nevertheless, in more complex, highly time-dependent flows, the averaging tends to smear out essential structures in the flow field and consequently may be inappropriate.
A completely different approach from RANS modeling is large eddy simulation (LES). The fundamental idea of LES is that large-scale energy-containing eddies vary in different flows, while the small scales are more universal. The large-scale eddies are solved directly in the LES approach, while the effects of smaller-scale eddies are modeled. LES is typically computationally less expensive than direct numerical simulations (DNS) and, of course, computationally more expensive than RANS models. The most important reason is that conventional LES requires more scales of turbulence to be resolved than RANS models. Therefore, grids designed for LES simulations are typically denser than RANS grids and less dense than DNS grids. However, thanks to the current advances in computational power, large grids and therefore LES for complex engineering flows have become feasible and very useful.
The purpose of the current Special Issue is to publish the most exciting research with respect to the above subjects and to spread the articles freely for research, teaching, and reference purposes.
Prof. Dr. Unai Fernández Gámiz
Manuscript Submission Information
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- flow control
- vortex modeling
- large eddy simulation (LES)
- turbulence modeling
- computational fluid dynamics (CFD)
- heat transfer
- cooling systems
- complex flows
- coherent structures