WebThe instability requires sufficiently strong streaks (the wall-normal circulation on either side of a streak exceeding 7.6) and is inviscid in nature, despite the proximity of the no-slip wall. Streamwise vortex formation (collapse) is dominated by stretching, rather than Kelvin–Helmholtz rollup, of instability-generated ω x sheets. WebDec 7, 2011 · The direct numerical simulation of turbulence (DNS) has become a method of outmost importance for the investigation of turbulence physics, and its relevance is constantly growing due to the increasing popularity of high-performance-computing techniques. In the present work, the DNS approach is discussed mainly with regard to …
On Direct Numerical Simulation of Turbulent Flows
WebApr 13, 2024 · In order to comprehensively study the flow pattern of the whole flow channel of the pump device, four schemes are selected according to the characteristic head. The characteristic head is 2.45 m in design, 2.75 m in maximum, … WebJul 31, 2014 · The concept of a minimal flow unit (MFU) for the study of the basic physics of turbulent flows is introduced. The MFU is an initial vorticity configuration that consists of a few simple well-defined large-scale vortex structures. indian tree animal
Off-wall boundary conditions for large-eddy simulation based on near …
Webdoi: 10.6052/1000-0992-15-006 Chunxiao XU , Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China More Information Abstract The discovery of coherent structures in turbulent shear flows is one of the most important advances in turbulence research of the last century. WebMar 31, 1991 · In this study, a temporal analysis is employed to elucidate underlying drag-reduction mechanisms among these methods. The analysis is based on the lifetime of … locke supply pryor