Computational fluid dynamics (CFD) is nowadays applied extensively in all aerodynamics-based topics of aircraft design, development and optimization. Since standard CFD approaches still lack accuracy in areas of highly nonlinear, unsteady flows close to the borders of the flight envelope, the aeronautical industry is increasingly willing to apply more costly scale-resolving methods, if such are able to provide a real predictive alternative for critical situations. While Large Eddy Simulation (LES) may be a viable option in certain areas, it is still far too costly—if not impossible—to apply it to high Reynolds number flows about even moderately complex configurations. Thus, the family of Hybrid RANS-LES Methods (HRLM) currently appears to be the best candidate for the next generation of CFD methods to increase solution fidelity at an industrially feasible expense. HRLM have been proven to perform considerably better than conventional Reynolds-Averaged Navier-Stokes (RANS or URANS) approaches in situations with strong flow separation, but they are less effective once they have to deal with weakly unstable1 flows, e.g. thin separation regions or shear layers in general. In such cases, resolved structures develop only very slowly, resulting in areas where the total amount of turbulence (both in modeled and resolved terms) is unphysically low. These so-called “Grey Areas” often lead to results that are worse than those of RANS simulations
| کتاب | |
| حوزه تخصصی کتاب | سیالات |
| تعداد فصل های کتاب | 6 |
| زبان کتاب | ENGLISH |
| مشخصات کلی | |
| تعداد صفحات | 274 |
| تعداد صفحات محصول | بیش از 200 |
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Notes on Numerical Fluid Mechanics and Multidisciplinary Design
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