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Comparison of different turbulence models in predicting cohesive fluid mud gravity current propagation

International Journal of Sediment Research 2020年第5期35卷 504-515页

作者： Seyed-Mohammad-Kazem Emami Sayed-Farhad Mousavi khosrow hosseini Hesam Fouladfar Majid Mohammadian Faculty of Civil Engineering University of Semnan Iran Water & Power Resources Development Company 3. Department of Civil Engineering University of Ottawa

A numerical study of propagation of cohesive fluid mud gravity currents in the form of lock-exchange was done using the OpenFOAM open source *** Eulerian approach solution for three separate phases was developed by incorporating a rheological model to predict the front position of cohesive fluid mud gravity *** model also simulates features in the complete movement phases including slumping,self-similar,and viscous in which the dynamics of propagation are affected by the balance of viscous and buoyancy forces,and the inertia force is *** influence of using different turbulence models containing sub-grid scale(SGS),modified SGS,detached eddy simulation(DES),delayeddetached eddy simulation(DDES),Launder-R eece-Rodi(LRR),and k-ε models on the accuracy of simulation results was evaluated by comparing with available experimental *** results show that the selection of the proper turbulence model is one of the most important issues for this type of the numerical *** more efficient turbulence model was suggested and tabulated for each stage of propagation and different selected concentrations of 1,045,1,140,and 1,214 g/*** different turbulence models(except k-ε) lead to front propagation dynamic simulation results that are in good agreement with the experimental measurements in the early stage of propagation for low concentrations,only DES,SGS,and modified SGS are able to capture the Kelvin-Helmholtz instability vortex shapes at the dense fluid interface,which is the main characteristic of the gravity current through the slumping *** calculated accuracies of SGS and modified SGS in predicting gravity current propagation for the both self-similar and viscous phases also are slightly better than DES,DDES,and LRR model *** results of this study confirmed the performance and efficiency of the modified SGS model in which the interaction coefficients between phases are calibrated for the numerical modeling of fluid mud

关键词： Gravity current Turbulence model Numerical simulation Cohesive particles Rheology

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Comparison among Ocular Response Analyzer,Corvis ST and Goldmann applanation tonometry in healthy children

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International Journal of Ophthalmology(English edition) 2018年第8期11卷 1330-1336页

作者： Ramin Salouti Ali agha Alishiri Reza Gharebaghi Mostafa Naderi khosrow Jadidi Ahmad Shojaei-Baghini Mohammadreza Talebnejad Zahra Nasiri Seyedmorteza hosseini Fatemeh Heidary Department of Ophthalmology Poostchi Ophthalmology Research CenterShiraz University of Medical Sciences Department of Ophthalmology Baqiyatallah University of Medical Sciences Faculty of Mathematical Sciences Tarbiat Modares University Ophthalmic Research Center Shahid Beheshti University of Medical Sciences Immunoregulation Research Center Shahed University

AIM： To explore the relationship between different parameters of Ocular Response Analyzer（ORA） and Corvis ST（CST） in a sample of healthy Iranian school-aged children and the relationship between parameters of these 2 instruments against intraocular pressure（IOP）, measured by the Goldmann applanation tonometer（GAT-IOP）, age and gender, and find possible correlation between ORA and CST with ***： This cross-sectional study included 90 healthy children. A general interview and complete eye examination were performed. Following successful GATIOP measurement, ORA and CST were conducted. The CST parameters were A 1/2 length（A1 L, A2 L）, A 1/2 velocity（A1 V, A2 V）, highest concavity deformation amplitude（HCDA）, radius of curvature（Ro C）, peak distance（PD）, central corneal thickness（CCT） and IOP. The ORA parameters were corneal hysteresis（CH）, corneal resistance factor（CRF）, Goldmann-correlated IOP（IOP-G） and corneal compensated IOP（IOP-CC）. Extracted data was analyzed using the Statistical Package for Social Science ***： Totally 39 males with age of 9.08±1.60（6-12）y and 51 females with age of 8.96±1.55（6-13）y were included. Many CST parameters were significantly correlated with CH, CRF, IOP-G and IOP-CC. Some CST parameters had a significant correlation with GAT-IOP, including IOP-CST in both eyes and HCDA, A2 L, PD, and RoC in the left eye, but none with age, except A2 L in the right eye. The CRF measurement showed a significant correlation with GAT-IOP in both eyes and CH in the right eye, yet, none with age. Among all CST and ORA parameters, CCT-CST in both eyes and A1 L in right eye had a significant correlation with gender, although this was a negligible negative correlation. Comparison of mean IOP values by different devices showed a significantly highest IOP overestimation by CST and lowest by IOP-CC compared with GAT. Also, IOP-G versus IOP-CST significantly had the lowest IOP overestimation among others. Overall, either low positive correlation

关键词： Goldmann applanation tonometer OcularResponse Analyzer Corvis ST intraocular pressure children

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