Comment on ``Simulation of a two-dimensional Rayleigh-Benard system using the direct simulation Monte Carlo method``

Technical Report · Thu Jun 30 00:00:00 EDT 1994

DOI:https://doi.org/10.2172/371414· OSTI ID:371414

Garcia, A L ^[1]; Baras, F; Mansour, M M ^[2]

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1. Lawrence Livermore National Lab., CA (United States)
2. Universite Libre de Bruxelles (Belgium)

In a recent paper, Watanabe, {ital et. al.} used direct simulation Monte Carlo to study Rayleigh-B{acute e}nard convection. They reported that, using stress-free boundary conditions, the onset of convection in the simulation occurred at a Rayleigh number much larger than the critical Rayleigh number predicted by linear stability analysis. We show that the source of their discrepancy is their failure to include the temperature jump effect in the calculation of Rayleigh number.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 371414
• Report Number(s): UCRL-ID-116697; ON: DE96050332
• Resource Relation: Other Information: PBD: 30 Jun 1994
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES
66 PHYSICS
GAS FLOW
MATHEMATICAL MODELS
TEMPERATURE GRADIENTS
MONTE CARLO METHOD
COMPUTERIZED SIMULATION
BOUNDARY CONDITIONS
THERMODYNAMICS
KNUDSEN FLOW