Numerical Simulation of a Strongly Heated Gas Flowing Upward in a Vertical Tube Using a k–ε Model

2005 ◽  
Author(s):  
Adam H. Richards ◽  
Robert E. Spall ◽  
Donald M. McEligot
Keyword(s):  
Numerical Simulation ◽  
Mach Number ◽  
Turbulence Models ◽  
Viscous Sublayer ◽  
Vertical Tube ◽  
Fully Developed Flow ◽  
Property Variation ◽  
Low Mach Number ◽  
Sublayer Thickness ◽  
Flow Through

A two-layer k-ε model is used to model a strongly heated, low-Mach number gas flowing upward in a vertical tube. Heating causes significant property variation and thickening of the viscous sublayer, consequently a fully developed flow does not evolve. Two-equation turbulence models generally perform poorly under such conditions. However, in the present work, a two-layer k-ε model is shown to accurately predict this flow through adjustment of a model constant related to the viscous sublayer thickness.

Simulation of Strongly Heated Internal Gas Flows Using a Near-Wall Two-Equation Heat Flux Model

2006 ◽  
Author(s):  
Adam H. Richards ◽  
Robert E. Spall
Keyword(s):  
Heat Transfer ◽  
Turbulence Models ◽  
Viscous Sublayer ◽  
Vertical Tube ◽  
Transfer Model ◽  
Gas Flows ◽  
Property Variation ◽  
Flux Model ◽  
Improve Heat Transfer ◽  
Near Wall

A two-equation k-ω model is used to model a strongly heated, low-Mach number gas flowing upward in a vertical tube. Heating causes significant property variation and thickening of the viscous sublayer, consequently a fully developed flow does not evolve. Two-equation turbulence models generally perform poorly under such conditions. Consequently, in the present work, a near-wall two-equation heat transfer model is utilized in conjunction with the k-ω model to improve heat transfer predictions.

Velocity measurement in low Reynolds and low Mach number slip flow through a tube

2015 ◽  
Vol 60 ◽  
pp. 284-289 ◽  
Author(s):  
Vijay Varade ◽  
Amit Agrawal ◽  
S.V. Prabhu ◽  
A.M. Pradeep
Keyword(s):  
Mach Number ◽  
Velocity Measurement ◽  
Slip Flow ◽  
Low Mach Number ◽  
Flow Through ◽  
Low Reynolds

Efficient numerical simulation of aeroacoustics for low Mach number flows interacting with structures

2014 ◽  
Vol 55 (6) ◽  
pp. 1143-1154 ◽  
Author(s):  
Michael Kornhaas ◽  
Michael Schäfer ◽  
Dörte C. Sternel
Keyword(s):  
Numerical Simulation ◽  
Mach Number ◽  
Low Mach Number

scholarly journals Assessment of different turbulence models in simulating axisymmetric flow in suddenly expanded nozzles

2018 ◽  
Vol 7 (3.29) ◽  
pp. 243
Author(s):  
Sher Afghan Khan ◽  
Mir Owais Ali ◽  
Miah Mohammed Riyadh ◽  
Zahid Hossen ◽  
Nafis Mahdi Arefin
Keyword(s):  
Numerical Simulation ◽  
Numerical Analysis ◽  
Mach Number ◽  
Numerical Simulations ◽  
Axisymmetric Flow ◽  
Turbulence Models ◽  
Experimental Results ◽  
Nozzle Flow ◽  
Axisymmetric Nozzle ◽  
Good Agreement

A numerical simulation was carried out to compare various turbulence models simulating axisymmetric nozzle flow past suddenly expanded ducts. The simulations were done for L/D = 10. The convergent-divergent nozzle has been modeled and simulated using the turbulence models: The Standard k-ε model, The Standard k-ω model and The SST k-ω model. Numerical simulations were done for Mach numbers 1.87, 2.2, and 2.58 and the nozzles were operated for NPRs in the range from 3 to 11. From the numerical analysis it is apparent that for a given Mach number and effect of NPR will result in maximum gain or loss of pressure. Numerical results are in good agreement with the experimental results.  

scholarly journals Numerical simulation of low Mach number reacting flows

2007 ◽  
Vol 78 ◽  
pp. 012004 ◽  
Author(s):  
J B Bell ◽  
A J Aspden ◽  
M S Day ◽  
M J Lijewski
Keyword(s):  
Numerical Simulation ◽  
Mach Number ◽  
Reacting Flows ◽  
Low Mach Number
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