Prediction of Two-Phase Flow in Small Tubes: A Systematic Comparison of State-of-The-Art CMFD Codes

Prediction of Two-Phase Flow in Small Tubes : A Systematic Comparison of State-of-The-Art CMFD Codes

Narayanan, C. (författare): ASCOMP GmbH, Technoparkstrasse 1, 8005 Z¨urich, Switzerland

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Abstract Ämnesord

Stäng

Multiphase dynamics and its characteristics for two-phase gas-liquid ﬂow have been investigatedby means of advanced numerical simulations. Although important in many engineering applications, methods for robust and accurate simulations for high density and viscosity ratios remainelusive. A comprehensive comparison of two state-of-the-art Computational Multi–Fluid Dynamics (CMFD) codes, Fluent and TransAT, have been performed. The two commonly usedmethods for two–phase ﬂow simulations, namely Volume of Fluid implemented in Fluent andLevel Set implemented in TransAT, could be compared as a result. Signiﬁcant diﬀerences wereobserved between the two ﬂow topologies predicted by the two codes. For the bubbly ﬂow case,a recirculating ﬂow was predicted inside the bubbles by TransAT, meanwhile no signiﬁcantrecirculation was observed in the solution with Fluent. For the slug ﬂow case a signiﬁcantdeviation was observed between the results from Fluent and TransAT on the slug formationand frequency. Periodic slug formation was observed with TransAT, in agreement with theexperimental result of Chen et al. [4]. A periodic slug formation was not obtained with Fluent.

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