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| Titel |
Toward modeling of multi-phase flow patterns using a combination of level sets and one-dimensional turbulence |
| VerfasserIn |
Heiko Schmidt, Falko Schulz, Alan R. Kerstein |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250054682
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| Zusammenfassung |
| From an engineering point of view the flow patterns formed in a pipe carrying two or more
immiscible fluids are among the most subtle, scientifically challenging emergent phenomena
of classical physics. They are technologically important due to their effects on transport of
materials of economic and societal importance, such as oil, gas, coal slurry, and carbon
dioxide. For underground sequestration, carbon dioxide is transported at pressures at which
several phases can coexist. A very similar physical problem in the geophysical
context is the turbulent generation of sea spray which is important for understanding
moist and aerosol transport into the lower atmosphere. All these applications are
challenging computationally as well as theoretically due to their sensitivity to small
scale phase dispersion and resegregation. To maximize the likelihood of successful
predictive simulation of such flows, the largest possible range of scales must be
resolved, and the parameterization of unresolved scales must be accurate. The key
modeling approach used here is One-Dimensional Turbulence (ODT) in which
turbulent flow evolution along a notional 1D line of sight is emulated by applying
instantaneous maps to represent the effect of individual turbulent eddies on property profiles
along the line. Velocity profiles evolve on the line, controlling map occurrences
and affected by those occurrences, resulting in self-contained flow evolution that
obeys applicable conservation laws. On this line of sight through the multi-phase
flow a sequence of phase intervals are represented using level set techniques which
prevent the phases from artificially numerical smearing. The surface tension at
interfaces stores potential energy and the ODT processes can create, move, and
annihilate interfaces. The hybrid ODT level set concept will be outlined in the poster. |
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