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Computational Fluid Dynamics and its applications
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The Application of the Two-fluid model of Turbulence to ducted Flames
J.Z. Wu
pp 8-58
Abstract.
Turbulent Heat and Momentum Transfer in Rough Tubes
M.R. Malin and J.D. Parry
pp 59-80
Abstract.
Generalised wall Functions for Turbulent Flow
H.I. Rosten and J.K. Worrel
pp 81-109
Abstract.
Modifying a Body-Fitted Coordinate grid during a PHOENICS
computations
D.B. Spalding
pp 110-140
Abstract.
The Application of the Two-fluid model of Turbulence to ducted Flames
J.Z. Wu,
PHOENICS Journal of CFD & its applications, volume 1, No1, pp 8-58
A new version of the two-fluid model of turbulence proposed by Spalding (1985) is applied to ducted flames . The investigation has been performed by parametric variations to optimise the model constants; and the results with chosen constants, obtained by means of PHOENICS computer code, are compared with the experimental data of Shipman et al (1963); the effects of boundary conditions and grid fitness are also reported.
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Turbulent Heat and Momentum Transfer in Rough Tubes
M.R. Malin and J.D. Parry,
PHOENICS Journal of CFD & its applications, volume 1, No1, pp 59-80
Numerical calculations are reported of friction and heat transfer in smooth and rough tubes. The wall-function formulae of Jayatilleke for sand-grain roughness are used as a component of a prediction procedure for friction factors and Stanton numbers, for Reynolds numbers ranging from 1e4 to 4.10e7 and Prandtl numbers ranging from 1.2 to 6.0. Results are obtained for relative roughness heigghts ranging from zero to 0.001. The computed results are found to be in very good agreement with the available experimental data for the full range of conditions from smooth to fully rough. The version of PHOENICS used was 1.4.
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Generalised wall Functions for Turbulent Flow
H.I. Rosten and J.K. Worrel,
PHOENICS Journal of CFD & its applications, volume 1, No1, pp 81-109
The subroutine GXWFUN that is called from GREX2 to calculate wall functions has been improved in three respects by provision of:
In addition, the coding has been protected against inadvertent execution of the VAL settings for EP; and minor economies have been introduced. The whole is provided as a new subroutine, GEWFUN, which is a replacement for the subroutine GXWFUN of PHOENICS version 1.4.
An example of use of the generalised wall-function option is provided, and a reference is supplied in which the use of rough-wall wall-fuction is exemplified.
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Modifying a Body-Fitted Coordinate grid during a PHOENICS computations
D.B. Spalding,
PHOENICS Journal of CFD & its applications, volume 1, No1, pp 110-140
A set of subroutines is described which, when linked with the PHOENICS EARTH load module and appropriately called from a GROUND subroutine, permit a body-fitted-coordinate grid to be modified during the course of a PHOENICS computation.
The cruicial step is the bringing of the corner coordinates of the grid into the F-array of EARTH, so that they can be manipulated in the same way as other EARTH variables. Some of the subroutines are provided so as to make the manipulation easy; others are associated with the writing to the disc file of the altered corner coordinates.
The opportunity has been taken to make the complete set of BFC geometrical quantities as easily accessible from GROUND as are other EARTH variables.
The use of the subroutines is illustrated by reference to the simulation of the emptying of a bladder, which changes its shape with time.
Other features which are illustrated include the use of GRAPH for the eliciting of non-standard line-printer output, and the dumping to disc of grid and field values at intermediate times, for subsuquent use by PHOTON.
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