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 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.

The rapid distortion theory is used to study the turbulent flow over sand waves;and the effect of the irrotational strain and the pre-existing shearing motion on the turbulence characters at the peak of sand wave is investigated emphatically.

Sagittal split ramus osteotomy and rapid orthodontics postoperation for correction of mandibular prognathism deformity;

Main factors that cause the cone burning of solid propellant were emphatically analyzed and compared,such as the concentration of fine oxidizer particle and the migration of plasticizer and curing agent at the interface near the wall.