Applications of multigrid methods to turbulent incompressible flows

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1988

OSTI ID:5293411

Barthelson, S H

The current study further develops the application of multigrid methods to the acceleration of convergence of turbulent, incompressible flow codes. Specifically, it extends the application of multigrid codes to stream-function-vorticity codes, already extensively used with laminar multigrid codes; the use of multigrid with primitive variable turbulent, incompressible flow codes has already been established. A new zero order equation model, the partial-slip turbulence model, is introduced and used concurrently with the older, more well established k-{var epsilon} turbulence model in the application of multigrid to stream-function-vorticity codes. This partial-slip model is demonstrated to lead to considerably faster convergence than the k-{var epsilon} model even without multigrid by virtue of the fact that fewer equations need to be solved. The current study also introduces the multigrid-like concept MOSI. MOSI combines red-black coarsening with the MSI algorithm to yield a much faster elliptic solver. MOSI is demonstrated to stabilize turbulent, primitive variable codes that use the SIMPLEC algorithm; it accomplishes this by means of better solving the pressure correction equation.

• Research Organization: Toledo Univ., OH (USA)
• OSTI ID: 5293411
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
COMPUTER CODES
CONVERGENCE
FLUID FLOW
INCOMPRESSIBLE FLOW
M CODES
NUMERICAL SOLUTION
TURBULENT FLOW