A finite volume method to solve the frost growth using dynamic meshes

Bartrons, Eduard; Oliet, C.; Gutiérrez, Enrique; Naseri, Alireza; Segarra, Carlos David Pérez

doi:10.1016/j.ijheatmasstransfer.2018.03.104

Cited by 23 publications

(13 citation statements)

References 32 publications

(46 reference statements)

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“…13 indicate that convection within the range ε v ∈ [0.9−0.99] becomes less important when increasing the value of the constant C, as seen by the close to zero velocity values observed in that region. Indeed, the larger the C -value is, the bigger is the region with high porosity values, a fact that agrees qualitatively to the solutions without convection obtained in [19].…”

Section: Resultssupporting

confidence: 87%

“…The water vapour transport and energy equations deduced in [19,29] are here extended to account for the advective terms. Observe that these terms, which appear in Eqs.…”

Section: Author Diffusion Resistance Factormentioning

confidence: 99%

“…The air is treated as a semi-perfect gas. The reader is referred to [19] for a further description of the implemented correlations of the thermo-physical properties of the model.…”

Section: Author Diffusion Resistance Factormentioning

confidence: 99%

“…The dynamic mesh method presented in [19], which neglected the convection within the frost sheet, reported porosity values above 0.9 in approximately 80% of the frost layer thickness. In this method, an artificially enhanced diffusion resistance factor (µ > 1) was needed in order to match the experiments, namely, Le Gall's correlation [17] with a factor F=5.…”

Section: Numerical Testsmentioning

confidence: 99%

“…The first is more common in the literature, despite its inherent lack of accuracy when tracking the frost-air interface [11,10,12]. When dynamic meshes are used, an ALE formulation is set to correct the mass and energy fluxes due to the imposed grid deformations derived from the frost growth [16,17,18,19]. The two domains are then coupled by means of a mass and energy balance at the frost-air interface along with a water vapour pressure condition.…”

mentioning

confidence: 99%

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Fixed grid numerical modelling of frost growth and densification

Bartrons

Galione

Segarra

2019

International Journal of Heat and Mass Transfer

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Section: Resultssupporting

confidence: 87%

“…The water vapour transport and energy equations deduced in [19,29] are here extended to account for the advective terms. Observe that these terms, which appear in Eqs.…”

Section: Author Diffusion Resistance Factormentioning

confidence: 99%

“…The air is treated as a semi-perfect gas. The reader is referred to [19] for a further description of the implemented correlations of the thermo-physical properties of the model.…”

Section: Author Diffusion Resistance Factormentioning

confidence: 99%

Section: Numerical Testsmentioning

confidence: 99%

mentioning

confidence: 99%

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Fixed grid numerical modelling of frost growth and densification

Bartrons

Galione

Segarra

2019

International Journal of Heat and Mass Transfer

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Evaporation of anhydrous ammonia from small concrete coupons and implications regarding evaporation from a large accidental spill on concrete

Languirand,

Phung,

Hanna

et al. 2023

Process Safety Progress

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Anhydrous ammonia is transported via ship, rail, and road everyday in the United States as a refrigerated liquid at ambient pressure. As a result, unintential release of a large amount of anhydrous ammonia could result from an accident during transportation. The aim of this paper is to provide a better understanding of the evaporation of anhydrous ammonia from porous media. In our investigation, laboratory‐scale concrete coupons were used as a surrogate for a larger concrete pad that could be present in an event involving an unintentional release of liquid anhydrous ammonia. Concrete coupons sized 5 cm × 5 cm × 1.9 cm were saturated in liquid anhydrous ammonia, and measurements of the subsequent evaporation from the coupons were made in an environmental chamber. The ambient air temperature within the chamber varied from 5 to 45°C, and the relative humidity varied from 5% to 75%. Mass‐difference calculation and Berthelot's reaction were used to determine the average evaporation rate from a concrete coupon across all trials, which was found to be 6.5 ± 1.9 mg/s. To validate these evaporation rates, the remaining ammonia in the concrete coupon was measured for each trial. We found that the time‐integrated calculated evaporation rates correlated well with the total mass of ammonia that was lost from the coupons. In addition, it was found that ambient air temperature and relative humidity had little influence on anhydrous ammonia evaporation from the concrete coupons.

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A scalable framework for the partitioned solution of fluid–structure interaction problems

et al. 2020

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In this work, we present a scalable and efficient parallel solver for the partitioned solution of fluid-structure interaction problems through multi-code coupling. Two instances of an in-house parallel software, Ter-moFluids, are used to solve the fluid and the structural sub-problems, coupled together on the interface via the preCICE coupling library. For fluid flow, the Arbitrary Lagrangian-Eulerian form of the Navier-Stokes equations is solved on an unstructured conforming grid using a second-order finitevolume discretization. A parallel dynamic mesh method for unstructured meshes is used to track the moving boundary. For the structural problem, the nonlinear elastodynamics equations are solved on an unstructured grid using a second-order finite-volume method. A semi-implicit FSI coupling method is used which segregates the fluid pressure term and couples it strongly to the structure, while the remaining fluid terms and the geometrical nonlinearities are only loosely coupled. A robust and advanced multivector quasi-Newton method is used for the coupling iterations between the solvers. Both the fluid and the structural solver use distributed-memory parallelism. The intra-solver communication required for data update in the solution process is carried out using non-blocking point-to-point communicators. The inter-code communication is fully parallel and point-to-point, avoiding any central communication unit. Inside each single-physics solver, the load is balanced by dividing the computational domain into fairly equal blocks for each process. Additionally, a load balancing model is used at the inter-code level to minimize the overall idle time of the processes. Two strating the accuracy and computational efficiency of the coupled solver. Strong scalability test results show a parallel efficiency of 83% on 10,080 CPU cores.

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A finite volume method to solve the frost growth using dynamic meshes

Abstract: Portal del coneixement obert de la UPC http://upcommons.upc.edu/e-prints Aquesta és una còpia de la versió author's final draft d'un article publicat a la revista International Journal of Heat and Mass Transfer.

Cited by 23 publications

References 32 publications

Fixed grid numerical modelling of frost growth and densification

Fixed grid numerical modelling of frost growth and densification

Evaporation of anhydrous ammonia from small concrete coupons and implications regarding evaporation from a large accidental spill on concrete

A scalable framework for the partitioned solution of fluid–structure interaction problems

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