Sliding Mesh Simulation of Transitional, Non-Newtonian Flow in a Baffled, Stirred Tank

Jaworski, Z.; Wyszyński, Miroslaw L.; Badham, R. S.; Dyster, Kate N.; Moore, I. P. T.; Özcan-Taşkın, N. Gül; Nienow, Alvin W.; McKemmie, J.

doi:10.1007/978-3-322-89838-8_15

Cited by 4 publications

(10 citation statements)

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“…Based on the previous results (Jaworski et al, 1996) for the Rushton turbine and on the general literature, it was expected that the quality of the CFD modelling for the new impeller would be the best if the sliding mesh option were applied. This approach is potentially the most promising in analysing flows from various impellers and the solutions provide angle-resolved velocities in the whole tank.…”

Section: H=tmentioning

confidence: 99%

“…The standard practice in BFC is to assign a constant grid index (one of the three 1, J or K ) to the meshed surface. Because of the overlap of the blades required for good gas dispersion (Nienow, 1996), these requirements could not be met. Therefore, another approach was also used.…”

Section: Meshing For a Sliding Mesh Solutionmentioning

confidence: 99%

“…The free surface was treated as a symmetry boundary with no friction and zero gradients of velocity. The RNG k-E model of turbulence was applied in all cases as it is considered to be superior to the standard k-E model for the modelling of highly swirling flows (Jaworski et al, 1996). The standard condition for numerical convergence of the total normalised residuals of less than lW3 was applied.…”

Section: Impeller Boundary Conditionmentioning

confidence: 99%

“…The measurements were undertaken in a tank of diameter T = 22 cm, with a liquid height H = T, and with an impeller of diameter, D = 0.45 T (Figure 1 b) rotating at 200 rpm. This particular shape with significantly overlapping blades was chosen because of its effectiveness for gas dispersion, especially in the up-pumping mode (Nienow, 1996). Here, in Part 11, a computational fluid dynamics (CFD) analysis of the flow in the same stirred, baffled tank is described and the predictions are compared with the LDA measurements.…”

mentioning

confidence: 99%

“…The fourth method is a more advanced application of the rotating reference frame and is known as the sliding mesh technique (Demirdzic and Peric, 1990), which was first applied to stirred tanks in I993 by Luo et al (1993) and by Pemg and Murthy (1993). The method, although computationally expensive, allows the noslip condition to be satisfied both at the impeller and at the wall, and normally does not require any input from experiments in order to obtain a solution (for example, Jaworski et al, 1996;Jaworski et al, 1997a), i.e., it is a so-called "fully predictive" method. The sliding mesh option has been mainly used to model the Rushton turbine impeller.…”

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confidence: 99%

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A study of an up‐ and a down‐pumping wide‐blade hydrofoil impeller: Part II. CFD analysis

et al. 1998

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Two different ways of using CFD to determine the flow field produced by the complex, wide-blade hydrofoil impeller are presented. The use of the "sliding mesh" approach was not successful and the reasons are discussed. Details of the numerical solution of the momentum transfer equations are described for the case of an axially-symmetrical jet model. The flow field for the single impeller pumping either upwards or downwards at 200 rpm was simulated using the structured Fluent code. Good agreement of CFD predictions with LDA velocity data was found, though the maximum local energy dissipation rate was 2'/2 to 5 times lower than was estimated from the experiments. The power numbers predicted by CFD were slightly higher than those obtained experimentally. The flow fields for dual and triple impellers pumping upwards were also simulated and used to guide larger scale homogenisation experiments.On presente deux faqons differentes d'utiliser la CFD pour determiner le champ d'ecoulement produit par une turbine profilee complexe APV-B2 a larges pales. Le recours a "maillage glissant" n'a pas reussi et on en analyse les raisons. Les donnees de la solution numerique des equations de transfert de moment sont decrites en detail prou le cas du modele a jet axialement symetrique. Le champ d'ecoulement du pompage d'une turbine unique dans le sens soit ascendant ou descendant a 200 tr/min a ete simule a I'aide du code Fluent structure. Un bon accord est obtenu entre les predictions de la CFD et les donnees de vitesses de la LDA, bien que le taux de dissipation de I'energie locale maximale soit de 2 fois 1/2 a 5 fois plus petit que celui estime dans les experiences. Les nombres de puissance predits par la CFD sont Iegerement plus grands que ceux obtenus experimentalement. Les champs d'ecoulement pour des turbines doubles et triples B pompage ascendant ont egalement ete simules et utilises pour guider des experiences d'homogeneisation a plus grande echelle.

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Section: H=tmentioning

confidence: 99%

Section: Meshing For a Sliding Mesh Solutionmentioning

confidence: 99%

Section: Impeller Boundary Conditionmentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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