New PDF release: New Results in Numerical and Experimental Fluid Mechanics

By B. Anil Mertol (auth.), Prof. Dr. Cameron Tropea, Dr. Suad Jakirlic, Dr. Hans-Joachim Heinemann, Prof. Rolf Henke, Prof. Dr. Heinz Hönlinger (eds.)

ISBN-10: 3540744584

ISBN-13: 9783540744580

ISBN-10: 3540744606

ISBN-13: 9783540744603

This quantity comprises the contributions to the 15. Symposium of the STAB (German Aero-space Aerodynamics Association). during this organization all these German scientists and engineers from universities, learn institutions and are concerned, who're doing learn and undertaking paintings in numerical and experimental fluid mechanics and aerodynamics, ordinarily for aerospace yet for different purposes, too. a number of the contributions are providing effects from nationwide and ecu group subsidized initiatives. the quantity supplies a vast evaluation over the continued paintings during this box in Germany, with the subjects being high-aspect ratio wings, low aspect-ratio wings, bluff our bodies, laminar circulation keep an eye on and transition, energetic circulate keep watch over, hypersonic flows, aeroelasticity, aeroacoustics, mathematical basics/ numerical simulation, actual basics, and facilities.

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Additional resources for New Results in Numerical and Experimental Fluid Mechanics VI: Contributions to the 15th STAB/DGLR Symposium Darmstadt, Germany, 2006

Example text

Despite these limits the URANS approach is often appealing because relatively cheap computations on 2-D grids are possible. A more sophisticated method for the simulation of problems with massively separated flow is Detached-Eddy Simulation (DES), a recent technique introduced by Spalart in 1997 [8]. This technique combines the URANS approach, employed in the regions of attached flow, and the Large-Eddy Simulation (LES), in the regions of massively separated flow, where URANS is not sufficiently accurate.

A dimensionless wave number kz∗ = kz rc = 2kπrc /Lx is defined for the wave number kz and the vortex-core radius rc . In fig. 6(b) the mean kinetic energy spectrum Ec∗k is shown as a function of time ∗ t and of the dimensionless wave number kz∗ . 5. The related non-dimensional wave length is λk = Lx /k. 9. The mean kinetic energy spectrum also shows a growth in all modes, not only in the mode of the elliptical instability. 4 0 2 4 6 8 10 12 14 16 18 20 t* ) Fig. 2. Temporal development of circulation for short-wave instability (—) LES, (∗, ×) measurements from [11], (· · ·) simulations from [10] Fig.

That is, the oscillations dissipate and then the instabilities grow, however, at a much smaller rate. The mean kinetic energy spectrum Ec∗k in fig. 6(d) shows mainly the growth of the lowest mode, while the increase of the instabilities at higher modes is saturated at a low level. 1 short-wave instabilities saturate at a low level. This means that the energy spectrum of the short-wave modes reaches an low-level plateau such that the growing short-wave instabilities do not lead to the breakdown of the vortex system.

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New Results in Numerical and Experimental Fluid Mechanics VI: Contributions to the 15th STAB/DGLR Symposium Darmstadt, Germany, 2006 by B. Anil Mertol (auth.), Prof. Dr. Cameron Tropea, Dr. Suad Jakirlic, Dr. Hans-Joachim Heinemann, Prof. Rolf Henke, Prof. Dr. Heinz Hönlinger (eds.)


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