The goal of the present study was to perform a large eddy simulation of vertical turbulent annular pipe flow under conditions in which fluid properties vary significantly, and to investigate the effects of buoyancy on the turbulent structures and transport. Isoflux wall boundary conditions with low and high heating are imposed. The compressible filtered Navier-Stokes equations are solved using a second order accurate finite volume method. Low Mach number preconditioning is used to enable the compressible code to work efficiently at low Mach numbers. A dynamic subgrid-scale stress model accounts for the subgrid-scale turbulence. Comparisons were made with available experimental data. The results showed that the strong heating and buoyant force caused distortions of the flow structure resulting in reduction of turbulent intensities, shear stress, and turbulent heat flux, particularly near the wall.
|Number of pages||10|
|Journal||International Journal of Heat and Mass Transfer|
|Publication status||Published - 2004 Jan|
Bibliographical noteFunding Information:
The authors are grateful to the National Science Foundation (NSF) and the Department of Energy under the NERI program for support through grants CTS-9806989 and DE-FG03-995F21924. The Iowa State High Performance Computing Center and University of the Minnesota Supercomputing Institute provided computational resources needed for this research.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Mechanical Engineering
- Fluid Flow and Transfer Processes