Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/20266
Title: Comparison of three separated flow models
Authors: Zhang, HQ
Yang, WB
Chan, CK 
Lau, KS
Keywords: Fluctuating velocities
Fluids
Particles
Stochastic methods
Issue Date: 2002
Publisher: Springer
Source: Computational mechanics, 2002, v. 28, no. 6, p. 469-478 How to cite?
Journal: Computational mechanics 
Abstract: An improved stochastic separated flow (ISSF) model developed by the present authors is compared with two other widely used trajectory models, the deterministic separated flow (DSF) model and the stochastic separated flow (SSF) model, in numerical simulations of gas-particle flows behind a backward-facing step. The DSF and ISSF models are found to need only 250 computational particles to obtain a statistically stationary solution of mean and fluctuating velocities of the particles, while the SSF model requires as many as 10,000 computational particles. Apart from comparing the sensitivity of required computational particles for different models, prediction capability of different models on mean velocities, fluctuating velocities and re-circulation region are also compared in this paper. Predicted results of streamwise mean velocity of particle phase agree well with experimental data for all the three models. For the mean fluctuating velocity of the particle phase, predictions using the ISSF model agree well with experiment data, while the DSF and the SSF models have a significant difference. Only the SSF and the ISSF models are capable of predicting re-circulation regions of the particle phase. As a comparison, the ISSF model has a distinct advantage over the other two models both in terms of accuracy and efficiency.
URI: http://hdl.handle.net/10397/20266
ISSN: 0178-7675
EISSN: 1432-0924
DOI: 10.1007/s00466-002-0312-4
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