Modeling the impact pressure of a free falling liquid block with OpenFOAM

Calderon-Sanchez, Javier; Duque, Daniel; Gómez‐Goñi, J.

doi:10.1016/j.oceaneng.2015.04.060

Cited by 7 publications

(2 citation statements)

References 11 publications

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“…During gravity casting process, the molten melt flowed from the guide tube to the mold shell in a free falling manner. In fact, the impact behavior of molten melt on the mold shell could be attributed as a liquid-solid impact [20][21][22] . Based on the above analysis, this paper constructed a physical model of the impact of molten metal on the mold shell.…”

Section: Discussionmentioning

confidence: 99%

Research on the Impact Behavior of Molten Metal on the Mold Shell in Gravity Casting of Large Titanium alloy Castings

ZHU,

LIN

et al. 2024

Res. Appl. Mater. Sci.

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The impact behavior of molten metal on the mold shell in gravity casting of large titanium alloy castings by investment precision castings was studied. The physical and mechanical models of the impact of molten metal on the mold shell during the pouring process were constructed using numerical simulation. The effects of molten metal pouring rate and pouring weight on the maximum impact force of the mold shell were studied. The research results indicated that during the entire pouring process, the impact force of the first molten metal contacting the mold shell was higher than subsequent molten metal. The maximum impact force increased with the increase of pouring rate and pouring weight. The total impact force of the molten metal on the mold shell was composed of the instantaneous impact force converted from instantaneous impulse and itself gravity. The instantaneous impact force of the molten metal that first impacts the mold shell was much greater than its own gravity, while the impact force of the molten metal at the end of pouring was much less than its own gravity. The maximum impact force on the mold shell of a large casting with a pouring weight of 800kg was about three times higher than that of a medium-sized casting with a pouring weight of 80kg.The difference in the total impact force on the mold shell between them mainly comes from the instantaneous impact force converted from instantaneous impulse.

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Section: Discussionmentioning

confidence: 99%

Research on the Impact Behavior of Molten Metal on the Mold Shell in Gravity Casting of Large Titanium alloy Castings

ZHU,

LIN

et al. 2024

Res. Appl. Mater. Sci.

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“…In the compressible solver, the equation of state for the ideal gas is adopted, where the gas coefficient (so does the speed of the sound) depends on the temperature fields obtained by the solutions of the thermodynamics with a heat capacity ( C v ) for each phase translating the temperature into the internal energy (C v(water) = 4190 J/kgK, C v(air) = 1005 J/kgK and C v(oil) = 1970 J/kgK). The details of this model can be found in . The compressible solver has been validated by using a wide range of the experimental data available in literature, that is, .…”

Section: Role Of Compressibility Of Fluidsmentioning

confidence: 99%

Turbulence modelling and role of compressibility on oil spilling from a damaged double hull tank

Yang

Yan

et al. 2016

Numerical Methods in Fluids

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This is the accepted version of the paper.This version of the publication may differ from the final published version. Permanent repository link AbstractThe viscosity plays an important role and a multi-phase solver is necessary to numerically simulate the oil spilling from a damaged double hull tank (DHT). However, it is uncertain whether turbulence modelling is necessary, which turbulence model is suitable; and what the role of compressibility of the fluids is. This paper presents experimental and numerical investigations to address these issues for various cases representing different scenarios of the oil spilling, including grounding and collision. In the numerical investigations, various approaches to model the turbulence, including the large eddy simulation (LES), direct numerical simulation (DNS) and the Reynolds Average Navier-Stokes equation (RANS) with different turbulence models, are employed. Based on the investigations, it is suggested that the effective Reynolds numbers (Re) corresponding to both the oil outflow and the water inflow shall be considered when classifying the significance of the turbulence and selecting the appropriate turbulence models. This is confirmed by new lab tests considering the axial offset between the internal and the external holes on two hulls of the DHT. The investigations conclude for numerically simulating oil spilling from a damaged double hull tank (DHT) that when the effective Re is smaller the RANS approaches should not be used and LES modelling should be employed; while when the effective Re is large, the RANS models may be used as they can give similar results to LES in terms of the height of the mixture in the ballast tank and discharge but costing much less CPU time. The investigation on the role of the compressibility of the fluid reveals that the compressibility of the fluid may be considerable in a small temporalspatial scale but plays an insignificant role on macroscopic process of the oil spilling.

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