2D Jet Simulation Updates Jan.23 rd 2014 Yan Zhan SUNY Stony Brook 1.

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Presentation transcript:

2D Jet Simulation Updates Jan.23 rd 2014 Yan Zhan SUNY Stony Brook 1

Problem 1: Water-Air Jet An axis-symmetric water jet into still air with a mean bulk velocity of m/s (D = 0.01m, and Re = 50,000). 2

Boundary Conditions Outflow 3

Jet Characteristics Physical Characteristics Numerical Characteristics – Determination of the mesh size: Assume only primary breakup, the critical liquid Weber number is 10, then Δx_critical = 34.4μm 4 Diameter (D)VelocityTurbulent Intensity m m/su‘/U = 0.05 PhaseDensityViscositySurface Tension Air1.225 kg/m ×10 -5 m 2 /s N/m Water998 kg/m 3 0.9×10 -6 m 2 /s

Mesh Halved (axis-symmetric) model with grid# of 822,000 5

Results (t = s) 6

Problem 2: Menard’s Test [1] 7 [1] T. Menard, etc., Coupling level set/VOF/ghost fluid methods: Validation and application to 3D simulation of the primary break-up of a liquid jet, International Journal of Multiphase Flow 33 (2007) 510–524 50D 20D An axis-symmetric liquid jet into still gas with a mean bulk velocity of 100 m/s (D = 100 μm, and Re = 5,800).

Menard’s Results [1] 8 Jet development and penetration (dt = 2.5 μm)

Boundary Condition 9 50D 20D Outflow

Jet Characteristics Physical Characteristics Numerical Characteristics – Determination of the mesh size: Assume only primary breakup, the critical liquid Weber number is 10, then Δx_critical = 2.36 μm 10 Diameter (D)VelocityTurbulent Intensity 100 μm100 m/su‘/U = 0.05 PhaseDensityViscositySurface Tension Gas25 kg/m 3 4x10 -7 m 2 /s 0.06 N/m Liquid696 kg/m ×10 -6 m 2 /s

Mesh 11 Halved (axis-symmetric) model with grid# of 1,146,880

Results 12 Set Up 1 (t = 0 s):

Results 13 Set Up 1 (t = 10 μs):

Results 14 Set Up 1 (t = 30 μs):

Results 15 Set Up 2 (iteration = 0 ):

Results 16 Set Up 2 (iteration = 1500 ): :

Results 17 Set Up 2 (iteration = 3500) :

Results 18 Set Up 2 (iteration = 4500) : Next: Turn to Unsteady Simulation

More Information 19 [2] P-K Wu and G M Faeth, Onset and end of drop formation along the surface of turbulent liquid jets in still gases, Phys. Fluids, Vol. 7, No. 11, November 1995 Surface breakup regime map for turbulent liquid jets in still gases when aerodynamic effects are small (liquid/gas density ratios are larger than 500) [2]

More Information 20 Problem # Problem 12,90450, d10.387d Problem 211,6005, d106.4d