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Combined direct numerical simulation and long-wave simulation of a liquid film sheared by a turbulent gas flow in a channel

Bender, Achim and Stroh, Alexander and Frohnapfel, Bettina and Stephan, Peter and Gambaryan-Roisman, Tatiana (2019):
Combined direct numerical simulation and long-wave simulation of a liquid film sheared by a turbulent gas flow in a channel.
In: Physics of Fluids, pp. 022103, 31, (2), DOI: 10.1063/1.5064423, [Online-Edition: https://doi.org/10.1063/1.5064423],
[Article]

Abstract

In this work, the dynamics of a thin liquid film sheared by a turbulent gas flow are investigated numerically. It is known that evena constant interfacial shear stress affects film stability and dynamics. We are interested in the effect of turbulent fluctuations onthe film development. A combination of a direct numerical simulation (DNS) of the turbulent gas flow and a long-wave theory forthe liquid film evolution is used to study the effect of the turbulent shear stress fluctuations on the liquid film. The simulationis carried out in two steps. First, a DNS of a single-phase turbulent channel flow is conducted. The time-dependent turbulentshear stress at the lower wall is stored. In the second step, the time- and location-dependent turbulent shear stress serves asa boundary condition in a one-sided long-wave simulation of the liquid film to identify the effect of the turbulent gas flow onthe film stability and dynamics. The resulting film deformation is simulated for different Reynolds numbers, and an analysis ofthe film deformation and stability as a function of the turbulent shear stress fluctuations is given. The numerical simulations areaccompanied by a simplified linear analysis. The results show that the dynamics of the liquid film sheared by a turbulent gas flowdepend not only on the average shear stress at the liquid-gas interface but also on the amplitude as well as the temporal andspatial scales of the shear stress fluctuations.

Item Type: Article
Erschienen: 2019
Creators: Bender, Achim and Stroh, Alexander and Frohnapfel, Bettina and Stephan, Peter and Gambaryan-Roisman, Tatiana
Title: Combined direct numerical simulation and long-wave simulation of a liquid film sheared by a turbulent gas flow in a channel
Language: German
Abstract:

In this work, the dynamics of a thin liquid film sheared by a turbulent gas flow are investigated numerically. It is known that evena constant interfacial shear stress affects film stability and dynamics. We are interested in the effect of turbulent fluctuations onthe film development. A combination of a direct numerical simulation (DNS) of the turbulent gas flow and a long-wave theory forthe liquid film evolution is used to study the effect of the turbulent shear stress fluctuations on the liquid film. The simulationis carried out in two steps. First, a DNS of a single-phase turbulent channel flow is conducted. The time-dependent turbulentshear stress at the lower wall is stored. In the second step, the time- and location-dependent turbulent shear stress serves asa boundary condition in a one-sided long-wave simulation of the liquid film to identify the effect of the turbulent gas flow onthe film stability and dynamics. The resulting film deformation is simulated for different Reynolds numbers, and an analysis ofthe film deformation and stability as a function of the turbulent shear stress fluctuations is given. The numerical simulations areaccompanied by a simplified linear analysis. The results show that the dynamics of the liquid film sheared by a turbulent gas flowdepend not only on the average shear stress at the liquid-gas interface but also on the amplitude as well as the temporal andspatial scales of the shear stress fluctuations.

Journal or Publication Title: Physics of Fluids
Volume: 31
Number: 2
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute for Technical Thermodynamics (TTD)
Profile Areas
Profile Areas > Thermo-Fluids & Interfaces
Date Deposited: 21 Feb 2019 15:03
DOI: 10.1063/1.5064423
Official URL: https://doi.org/10.1063/1.5064423
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