Imperial College London
Portrait Picture

DrMichaelBluck

Faculty of Engineering, Department of Mechanical Engineering

Reader in Nuclear Engineering
 
 
 
//

Contact

 

+44 (0)20 7594 7055m.bluck

 
 
//

Location

 

658City and Guilds BuildingSouth Kensington Campus

//

Summary

 

Publications

Citation

BibTex format

@article{Duan:2019:10.1016/j.nucengdes.2018.11.036,
author = {Duan, Y and Jackson, C and Eaton, M and Bluck, M},
doi = {10.1016/j.nucengdes.2018.11.036},
journal = {Nuclear Engineering and Design},
pages = {60--77},
title = {An assessment of eddy viscosity models on predicting performance parameters of valves},
url = {http://dx.doi.org/10.1016/j.nucengdes.2018.11.036},
volume = {342},
year = {2019}
}
Download

RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The major objective of the present study is to evaluate the performance of a range of turbulent eddy viscosity models in the prediction of macro-parameters (flow coefficient (CQ) and force coefficient (CF)), for certain types of valve, including the conic valve, the disk valves, and the compensated valve. This has been achieved by comparison of numerical predictions with experimental measurements available in the literature. The examined turbulence models include most of the available turbulent eddy viscosity models in STAR-CCM+ 12.04. They are the standard k-ε model, realizable k-ε model, k-ω-sst model, V2F model, EB k-ε model and the Lag EB k-ε models.The low-Re turbulence models (k-ω-sst, V2F, EB k-ε and Lag EB k-ε) perform worse than the high-Re models (standard k-ε and realizable k-ε). For the conic valve, the performance of different turbulent models varies little; the standard k-ε model shows a marginal advantage over the others. The performance of the turbulence models changed greatly, however, for prediction of CQ and CF of the disk and compensated valves. In general, the realizable k-ε model is demonstrated to be a robust choice for both valve types. Although the EB k-ε may marginally outperform it in the prediction of CF at large disk valve opening.The effects of the unknown entry flow and initialization conditions are also studied. The predictions are more sensitive to the entry flow condition when the valve opening is large. Additionally, the uncertainties caused by unknown entry conditions are comparable to overall modelling errors in some cases. For flow systems with multiple stable flow-states coexisting in the flow domain, the output of the numerical models can also be affected by the initialization conditions.When the streamline curvature and secondary flow is modest like conical valve flow, the nonlinear modification of the standard k-ε mode
AU  - Duan,Y
AU  - Jackson,C
AU  - Eaton,M
AU  - Bluck,M
DO  - 10.1016/j.nucengdes.2018.11.036
EP  - 77
PY  - 2019///
SN  - 0029-5493
SP  - 60
TI  - An assessment of eddy viscosity models on predicting performance parameters of valves
T2  - Nuclear Engineering and Design
UR  - http://dx.doi.org/10.1016/j.nucengdes.2018.11.036
UR  - http://hdl.handle.net/10044/1/66578
VL  - 342
ER  -
Download