Application of the ASAP Technique in the Geophysical and Industrial Scales: a Comparison with BFC...
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Application of the ASAP Technique in the Geophysical and Industrial Scales:
a Comparison with BFC
Lombard, E., Palacio, Rodriguez, A., Salinas, M., Vicente, W.
Engineering Institute of the UNAM, Mexicoap. post. 70-472, Coyoacan 04510, Mexico D.F.
PHOENICS User’s ConferenceAustralia, May 2004
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Calculations for two very different scale situations:
1) A geophysical case represented by hydrodynamics in
a lake 2) An industrial facility represented by air flow in a
spillwater aerator
Two different approaches:
1) Body fitted coordinates2) Arbitrary Source Allocation Procedure Comparisons between the two models considering a
qualitative and quantitative point of view analyzing the flow patterns and the distribution of a scalar parameter.
INTRODUCTION
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U ρ Cτ = ad210
) - (1 = t max
)41
( |u| h 0.4 = *2
1 = max
LAKE
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Bathymetry of the lake
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BFC Grid
ASAP Grid
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Surface velocity distribution, BFC
Surface velocity distribution, ASAP
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Bottom velocity distribution, BFC
Bottom velocity distribution, ASAP
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ghPKkFr /K 321
AERATOR
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Spllwater aerator
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BFC Grid ASAP Grid
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Air velocity at bottom of spillway, BFC
Air velocity at bottom of spillway, ASAP
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Beta distribution at bottom of spillway, BFC
Beta distribution at bottom of spillway, ASAP
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CONCLUSIONS
•Considering a qualitative and quantitative point of view, both approaches show very much similitude in the results obtained when analyzing the flow patterns and the distribution of a scalar parameter.
• ASAP requires a very moderate relaxation for velocities and no relaxation for the pressure, while the BFC computations require stronger relaxation for velocities, and for cases like the ones here presented a heavy linear relaxation for the pressure with values oscillating between 2 and 3.
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• An overall preliminary analysis of the cases here presented, seem to indicate the calculations using the ASAP technique present more advantages when compared with the BFC approach:It allows to represent the domain in a more easy way by just defining the geometry with an autocad file and then simply assigning the desired grid refinement.Convergence is much easily attained.The results obtained do not suffer from grid generation problems, as for the BFC cases where the grid presents very skewed cells.
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FINFIN