Under the assumption of rapid distortion the RNG k ε turbulence model was modified to include the compressibility effects and applied to in cylinder turbulent flows in internal combustion engines.

In this paper rapid distortion theory is used to predict the effect of anisotropy on the structure of shear free boundary layer and axisymmetric straining turbulence.

In this paper the rapid distortion theory is summarized briefly,and the application of this theory to the description of shear-free boundary layer, wall pressure fluctuation, flow over a low obstacle, interaction between different turbulent scales and some other problems is also briefly reviewed.

WT5”BZ]In this paper, the characteristics of uniformly sheared turbulent boundary layer were studied with the rapid distortion theory, and emphasis was laid on its connection with shear free boundary layer. The effect of initial anisotropy on uniformly sheared turbulent boundary layer was also investigated.

In this paper theoretical wall pressure fluctuation spectrum calculated by Rapid Distortion Theory was used to predict the effect of circular transducer size on the measured statistical properties of wall pressure fluctuation signals. It was found that the measured onedimensional spectrum has a significant decreaSe at hish wave numbers due to attenuation by the finite size of the transducer, and wall pressure fluctuahon intensity decreases with the increase of the transducer size.

EFFECT OF CIRCULAR TRANSDUCER SIZE ON WALL PRESSURE FLUCTUATION SIGNALEFFECTOFCIRCULARTRANSDUCERSIZEONWALLPRESSUREFLUCTUATION. .

Under the assumption of rapid distortion, the RNG k-ε turbulence model is modified to include the compressibility effects and applied to in-cylinder turbulent flows of combustion engines.

However, the effects of the additional rapid distortion and return to isotropy terms on the formula are negligible when compared with the use of the simple return to isotropy term proposed by Rotta.

The importance of including additional terms for rapid distortion and return to isotropy in the modeling of the pressure-strain correlation in turbulent shear flows under the influence of external body forces is examined.

The effect of acceleration appears to be (at least qualitatively) of the same kind as is observed when turbulence is subjected to rapid distortion.

Interaction between the turbulence and the wave-induced air disturbances is treated by use of the mass and momentum conservation equations and the rapid distortion assumption.

Using the tools of large-eddy simulation (LES), rapid distortion theory andEulerian kinematic simulation, two-point properties of turbulenceare studied.

In this paper theoretical wall pressure fluctuation spectrum calculated by Rapid Distortion Theory was used to predict the effect of circular transducer size on the measured statistical properties of wall pressure fluctuation signals. It was found that the measured onedimensional spectrum has a significant decreaSe at hish wave numbers due to attenuation by the finite size of the transducer, and wall pressure fluctuahon intensity decreases with the increase of the transducer size.

In this paper the problem of homogeneous shearing turbulence approaching and passing an obstacle is studied by vorticity method and rapid distortion theory as well as a simple Reynolds stress model. The aim is to gain some insight into the effect of streamline curvature,initial anisotropy, upwind mean shear and relative strength of uniform mean shear on the turbulent structures over the obstacle. It is found that in the outer region of the obstacle the streamline curvature is of second order importance...

In this paper the problem of homogeneous shearing turbulence approaching and passing an obstacle is studied by vorticity method and rapid distortion theory as well as a simple Reynolds stress model. The aim is to gain some insight into the effect of streamline curvature,initial anisotropy, upwind mean shear and relative strength of uniform mean shear on the turbulent structures over the obstacle. It is found that in the outer region of the obstacle the streamline curvature is of second order importance compared with the effect of the irrotational flow field produced by the obstacle. It is also found that for shearing turbulence passing the obstacle the pre-existing shearing motion would have significant effect on the turbulent structures. Comparing the changes in the equation for Reynolds normal stresses derived by rapid distortion theory with that derived by Reynolds stress model with the pressure strain terms of Launder, Reece and Rodi form, the two results agree approximately only when the initial turbulence is isotropic and the upwind mean shear is small.

In this paper the rapid distortion theory is summarized briefly,and the application of this theory to the description of shear-free boundary layer, wall pressure fluctuation, flow over a low obstacle, interaction between different turbulent scales and some other problems is also briefly reviewed.