Diapositiva 1

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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 Users Conference Australia, May 2004
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INTRODUCTION

• Calculations for two very different scale
  situations
• A geophysical case represented by hydrodynamics
  in a lake
• An industrial facility represented by air flow in
  a spillwater aerator
• Two different approaches
• 1) Body fitted coordinates
• 2) 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.

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LAKE
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Bathymetry of the lake
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ASAP Grid
BFC 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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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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FIN