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Direct simulation of compressible turbulence in a shear flow
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Hussaini, M. Y. Sarkar, S. Erlebacher, G. |
| Copyright Year | 1991 |
| Description | Compressibility effects on the turbulence in homogeneous shear flow are investigated. The growth of the turbulent kinetic energy was found to decrease with increasing Mach number: a phenomenon which is similar to the reduction of turbulent velocity intensities observed in experiments on supersonic free shear layers. An examination of the turbulent energy budget shows that both the compressible dissipation and the pressure-dilatation contribute to the decrease in the growth of kinetic energy. The pressure-dilatation is predominantly negative in homogeneous shear flow, in contrast to its predominantly positive behavior in isotropic turbulence. The different signs of the pressure-dilatation are explained by theoretical consideration of the equations for the pressure variance and density variance. Previously, the following results were obtained for isotropic turbulence: (1) the normalized compressible dissipation is of O(M(sub t)(exp 2)); and (2) there is approximate equipartition between the kinetic and potential energies associated with the fluctuating compressible mode. Both of these results were substantiated in the case of homogeneous shear. The dilatation field is significantly more skewed and intermittent than the vorticity field. Strong compressions seem to be more likely than strong expansions. |
| File Size | 1500093 |
| Page Count | 46 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19910010748 |
| Archival Resource Key | ark:/13960/t1pg6kp7r |
| Language | English |
| Publisher Date | 1991-03-01 |
| Access Restriction | Open |
| Subject Keyword | Aerodynamics Potential Energy Turbulent Flow Shear Flow Computerized Simulation Energy Budgets Compressibility Effects Dissipation Vorticity Isotropic Turbulence Kinetic Energy Stretching Compressible Flow Mach Number Homogeneous Turbulence Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
