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Analysis of the influence of a sinusoidally varying periodic wall heating on the drag of turbulent pipe flow using direct numerical simulation

Dachwitz, Andre and Bauer, Christian and Wagner, Claus (2022) Analysis of the influence of a sinusoidally varying periodic wall heating on the drag of turbulent pipe flow using direct numerical simulation. In: 6th International conference on Turbulence and Interactions. 6th International conference on Turbulence and Interactions 2022, 2022-05-15 - 2022-05-20, Elba, Italien.

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Official URL: https://w3.onera.fr/ti2021/home

Abstract

Reliable predictions of turbulent flows with heat transfer are of great importance to many engineering applications. Several studies of turbulent pipe flow with homogeneous heating are discussed in the review article by Narasimha and Sreenivasan (1979) who reported that relaminarization in buoyancy aided pipe flows is caused by the damping of turbulent velocity fluctuations which resulted from heating. To determine the influence of sinusoidally varying temperature boundary conditions in circumferential direction φ at the wall of a straight pipe on the turbulent velocity fluctuations, we performed direct numerical simulations at a bulk Reynolds number of Reb = 4328, for a Prandtl number Pr = 0.71, a Grashoff number Gr = 9.5 · 105 and wall temperatures of Θw = sin(N · φ), N = 0, ..., 14. For an isothermal turbulent pipe flow, Wagner and Friedrich (2012) reported a mean spanwise spacing of velocity streaks in wall coordinates of λ+=120 at a wall distance of y+ = 15, which corresponds to the mean width of approximately seven streaks. Figure 1(a) shows a drop in the friction Reynolds number Reτ for N = 7 and 12, which nearly corresponds to streak spacing and half of it. Further it can be seen in Figure 1(b), streaks are longer for the isothermal case. At the conference a detailed analysis by means of instantaneous flow field observations and turbulence statistics will be presented.

Item URL in elib:https://elib.dlr.de/191992/
Document Type:Conference or Workshop Item (Speech)
Title:Analysis of the influence of a sinusoidally varying periodic wall heating on the drag of turbulent pipe flow using direct numerical simulation
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Dachwitz, AndreUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bauer, ChristianUNSPECIFIEDhttps://orcid.org/0000-0003-1838-6194UNSPECIFIED
Wagner, ClausUNSPECIFIEDhttps://orcid.org/0000-0003-2273-0568UNSPECIFIED
Date:16 May 2022
Journal or Publication Title:6th International conference on Turbulence and Interactions
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Turbulent pipe flow, direct numerical simulation, wall heating, drag reduction
Event Title:6th International conference on Turbulence and Interactions 2022
Event Location:Elba, Italien
Event Type:international Conference
Event Start Date:15 May 2022
Event End Date:20 May 2022
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 - NGT BIT (old)
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Ground Vehicles
Deposited By: Bauer, Christian
Deposited On:22 Dec 2022 10:59
Last Modified:24 Apr 2024 20:53

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