A stable SPH model with large CFL numbers for multi-phase flows with large density ratios

Rayleigh-Taylor instability problem with large density ratios is simulated by RKDG method which is developed for Euler equations with an additional body force corresponding to the gravity. The interface capturing ability of RKDG method is testified, while the density ratio (heavy to light) ranges from 3 to 20. Numerical results show that RKDG method has capability to pursue contact discontinuity in Rayleigh-Taylor instability with large density ratio. In the late stage of Rayleigh-Taylor instability problem, the contact line begins to crash, but the numerical solution is still smooth near the interface and has high resolution.

Download Full-text

Incompressible two-phase flow: Diffuse interface approach for large density ratios, grid resolution study, and 3D patterned substrate wetting problem

Computers & Fluids ◽

10.1016/j.compfluid.2016.04.011 ◽

2016 ◽

Vol 141 ◽

pp. 223-234 ◽

Cited By ~ 7

Author(s):

Yu Xie ◽

Olga Wodo ◽

Baskar Ganapathysubramanian

Keyword(s):

Two Phase Flow ◽

Grid Resolution ◽

Diffuse Interface ◽

Phase Flow ◽

Two Phase ◽

Patterned Substrate ◽

Large Density ◽

Density Ratios ◽

Resolution Study

Download Full-text

An SPH model for multiphase flows with complex interfaces and large density differences

Journal of Computational Physics ◽

10.1016/j.jcp.2014.11.037 ◽

2015 ◽

Vol 283 ◽

pp. 169-188 ◽

Cited By ~ 82

Author(s):

Z. Chen ◽

Z. Zong ◽

M.B. Liu ◽

L. Zou ◽

H.T. Li ◽

...

Keyword(s):

Multiphase Flows ◽

Large Density ◽

Sph Model

Download Full-text

Effects of Coolant Density Ratio on Film Cooling Performance on a Vane

Volume 5: Turbo Expo 2003, Parts A and B ◽

10.1115/gt2003-38582 ◽

2003 ◽

Cited By ~ 11

Author(s):

J. Michael Cutbirth ◽

David G. Bogard

Keyword(s):

Film Cooling ◽

Density Ratio ◽

Operating Conditions ◽

Cooling Performance ◽

Large Density ◽

Performance Trends ◽

Large Density Ratio ◽

Small Density ◽

Adiabatic Effectiveness ◽

Density Ratios

Film cooling performance was studied on a simulated turbine vane model with an objective of determining how much the coolant density ratio affects this performance. Experiments were conducted using coolant density ratios of 1.8 and 1.2. The purpose of the study was to determine if tests done at small density ratios (which is often more viable in a laboratory) can give reasonable predictions of performance at more realistic large density ratios. Furthermore, appropriate scaling parameters were determined. The mainstream flow was operated with low and high turbulence levels. Adiabatic effectiveness was measured in the showerhead region of the vane, and following the first row of coolant holes on the pressure side. Adiabatic effectiveness performance using small density ratio coolant gave performance trends similar to the large density ratio coolant, but quantitative values differed by varying amount depending on operating conditions.

Download Full-text