A Residual Thermodynamic Analysis of Turbulence – Part 2: Pipe Flow Computations and Further Development of Theory

Mattias GUSTAVSSON

doi:https://doi.org/10.5541/ijot.1017374

Makale detayları

A Residual Thermodynamic Analysis of Turbulence – Part 2: Pipe Flow Computations and Further Development of Theory

Yazarlar:

Mattias GUSTAVSSON

Yayıncı:

Uluslararası Uygulamalı Termodinamik Derneği İktisadi İşletmesi

Ana Başlıklar:

Diğer mühendislik dalları

Dergi:

International Journal of Thermodynamics 2022 Vol.25 Issue 2, pp.64-75

Belge Tipi:

Makale

Yayın Tarihi:

5/2022

Belge Dili:

İngilizce

Document ID (Org No.):

2000476455

Sıklık:

Üç Aylık

eISSN:

2146-1511

pISSN:

1301-9724

DOI:

https://doi.org/10.5541/ijot.1017374

Özet:

 

Single-phase turbulent pipe flows are analysed utilizing a new theory presented in a parallel paper. Arguably this new theory implies improvements in matching modelling results with experimental observations: To illustrate, unique for these computations is that a 1st law balance agreement between simulations and corresponding experiments is achieved, while resolving the time-averaged fluid flow velocity (including the various inner turbulent zones) and accounting for the wall surface roughness. Testing this new approach, the computations of 20 cases of turbulent pipe flow arrives at a remarkably high amount of kinetic energy dissipation occurring at near-wall positions, where some 54-83% of the net kinetic energy dissipation occurs within the viscous sublayer-, and 17-39% within the buffer layer. Although turbulence incorporates time-varying phenomena, e.g. swirls, large eddies, and breakup of the latter, it is argued that simulating these would have practically no effect on the net kinetic energy dissipation – and the associated wall shear stress – for the present pipe flow cases. Another illustration of the improvements relate to transition computations: While a proposed nominal transition model arrives at fair values of transition Reynolds numbers, some improvements on this transition analysis can be made, e.g. allowing for the modelling of the turbulence onset/offset hysteresis behaviour. For scientists who wish to model time-varying phenomena, e.g. for the study of mixing, boundary layer thickness, or wall-pressure fluctuations, there should be possibilities to implement this new theory in computational flow solvers.

Makale detayları

A Residual Thermodynamic Analysis of Turbulence – Part 2: Pipe Flow Computations and Further Development of Theory

Yazarlar: Mattias GUSTAVSSON

Yayıncı: Uluslararası Uygulamalı Termodinamik Derneği İktisadi İşletmesi

Ana Başlıklar: Diğer mühendislik dalları

Dergi: International Journal of Thermodynamics 2022 Vol.25 Issue 2, pp.64-75

Belge Tipi: Makale

Yayın Tarihi: 5/2022

Belge Dili: İngilizce

Document ID (Org No.): 2000476455

Sıklık: Üç Aylık

eISSN: 2146-1511

pISSN: 1301-9724

DOI: https://doi.org/10.5541/ijot.1017374

Sayı

Yazarlar:

Mattias GUSTAVSSON

Yayıncı:

Uluslararası Uygulamalı Termodinamik Derneği İktisadi İşletmesi

Ana Başlıklar:

Diğer mühendislik dalları

Dergi:

International Journal of Thermodynamics 2022 Vol.25 Issue 2, pp.64-75

Belge Tipi:

Makale

Yayın Tarihi:

5/2022

Belge Dili:

İngilizce

Document ID (Org No.):

2000476455

Sıklık:

Üç Aylık

eISSN:

2146-1511

pISSN:

1301-9724

DOI:

https://doi.org/10.5541/ijot.1017374