Environmental Engineering Reference
In-Depth Information
8.2 Numerical Study
The breakup length computed with the RSM is the highest compared to k-
ε
and
SST k-
model. The RSM also gives the highest standard deviation value
among all the turbulence models due to the fact that the RSM can predict more
faithfully the unsteady nature of the
ˉ
ˉ
model shows the
breakup length value similar to the RSM; however, the standard deviation value
is lower and behaves more similar to the computations with the k-
fl
ow. The SST k-
ε
model.
It could also be observed from the method of superposition that the RSM
produces a broader breakup distribution band. The SST k-
ˉ
model shows a
similar behavior but it results in a more uniformly distributed breakup pattern in
the region downstream of the ramp. And for k-
model, the breakup distribution
band is much thinner compared with the other two models.
ε
Observing the prehydraulic jump angles, the experiment result shows the pre-
hydraulic jump angles of 56
°
. RSM predicts signi
cantly high value with 54
°
compared to the rest of SST k-
ˉ
and k-
ε
that are around 41
°
and 31
°
,
respectively.
Overall, RSM shows the capability of predicting irregular, transient state and
complex
fl
flow in the two-phase
fl
flow simulation when comparing the results of
k-
ε
and SST k-
ˉ
model.
References
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Amano RS, Yi-Hsin Y, Hamman M, Kristopher, Joshua (2014) Experimental investigation of
liquid phase breakup in solid fuel rockets. In: 4th joint US-European
fl
fluids engineering
summer meeting (FEDSM2014), pp 21224, Chicago, IL
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54
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703
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Volume of Fluid (VOF) method for the dynamics of free
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225
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—
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www.web.anl.gov/PCS/acsfuel/preprint%
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566
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-
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