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Sessile super-droplets as quasi-static wall deformations in direct numerical simulation of turbulent channel flow

Bahavar, Philipp and Wagner, Claus (2024) Sessile super-droplets as quasi-static wall deformations in direct numerical simulation of turbulent channel flow. Computers & Fluids, 269 (106135), 1-??. Elsevier. doi: 10.1016/j.compfluid.2023.106135. ISSN 0045-7930.

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Official URL: https://www.sciencedirect.com/science/article/pii/S0045793023003602

Abstract

Condensation is an important aspect of many flow applications due to the ubiquitous presence of humidity in the air at ambient conditions. For direct numerical simulations of such flows, simulating the gas phase as a mixture characterized by temperature and humidity coupled by the latent heat release and absorption has been shown to yield results consistent with multiphase direct numerical simulations at reduced cost. In the case of surface condensation, the deposition of condensate droplets represents an additional mechanism for flow modification. Extending the single-phase approach by tracking the mean deposition rates and consolidating the condensate mass into static super-droplets reintroduces the effects of surface droplets on the flow while retaining the computational advantages of simulating only the gas phase. Results of simulations of turbulent flow through a cooled, vertical channel with and without such droplets illustrate the additional effects captured compared to the original approach. In the immediate vicinity of a super-droplet, turbulent heat and vapor transport towards the cooled wall is enhanced. Direct impingement and deflection of the flow on the super-droplet cause a qualitative change in the distribution of the condensation rates, increasing on the surface of the super-droplets and decreasing in the surrounding regions. This modification of the near-wall transport leads to increased global cooling and drying efficiency compared to a smooth channel.

Item URL in elib:https://elib.dlr.de/187212/
Document Type:Article
Title:Sessile super-droplets as quasi-static wall deformations in direct numerical simulation of turbulent channel flow
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Bahavar, PhilippUNSPECIFIEDhttps://orcid.org/0000-0003-3817-7875UNSPECIFIED
Wagner, ClausUNSPECIFIEDhttps://orcid.org/0000-0003-2273-0568UNSPECIFIED
Date:30 January 2024
Journal or Publication Title:Computers & Fluids
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:269
DOI:10.1016/j.compfluid.2023.106135
Page Range:1-??
Editors:
EditorsEmailEditor's ORCID iDORCID Put Code
UNSPECIFIEDElsevierUNSPECIFIEDUNSPECIFIED
Publisher:Elsevier
Series Name:Science Direkt
ISSN:0045-7930
Status:Published
Keywords:Direct numerical simulation, condensation, channel flow, heat transfer
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Rail Transport
DLR - Research area:Transport
DLR - Program:V SC Schienenverkehr
DLR - Research theme (Project):V - RoSto - Rolling Stock
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Ground Vehicles
Deposited By: Bahavar, Philipp
Deposited On:29 Nov 2023 14:13
Last Modified:29 Nov 2023 14:13

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