NUMERICAL SIMULATION OF FLUID SEEPAGE AND HEAT TRANSFER IN AQUIFER WITH LBM-MFLS COUPLED MODEL

Ma Jiuchen; Lyu Linhai; Yang Jie; Cui Afeng; Wei Fan

doi:10.19912/j.0254-0096.tynxb.2021-1450

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (5) : 30-39. DOI: 10.19912/j.0254-0096.tynxb.2021-1450

NUMERICAL SIMULATION OF FLUID SEEPAGE AND HEAT TRANSFER IN AQUIFER WITH LBM-MFLS COUPLED MODEL

Ma Jiuchen^1,2, Lyu Linhai¹, Yang Jie¹, Cui Afeng¹, Wei Fan^1,2

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Abstract

Taking the multiple moving finite line heat sources（MFLS） operation mode as the research object, the unsteady state analytical solutions of the excess temperature in aquifer ΔT_MFLSare obtained by applying space-time superposition principle, based upon the transient moving finite line heat source model. A calculation model coupled lattice Boltzmann method （LBM） and ΔT_MFLS is established, according to introduce the discrete force source term into the Lattice Bhatnagar-Gross-Krook （LBGK） evolution equation of the velocity distribution function. The coupled model and the calculation method are validated by the data determined from the in-situ thermal re-sponse test. The results show that coupled LBM-ΔT_MFLS simulation can well reproduce the evolution process of seepage velocity in aquifer which presents four successive stages of starting, declining, rising and stabilizing. With the decreasing of the porosity of aquifer, the movement space of virtual fluid particles reduces, consequently the collision probability of inter-particles and between particles and porous media increases, which leads to the kinetic energy loss enhancing, the descend range of seepage velocity increasing, and the recovery process retarding. While the inflow velocity increases, however, the influence degree of porosity on the hydrodynamic evolution of aquifer weakens. Meanwhile the directivity of the heat transport process in the aquifer enhances significantly.

Key words

geothermal energy / heat transfer / porous media / numerical models / aquifers / lattice Boltzmann method

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Ma Jiuchen, Lyu Linhai, Yang Jie, Cui Afeng, Wei Fan. NUMERICAL SIMULATION OF FLUID SEEPAGE AND HEAT TRANSFER IN AQUIFER WITH LBM-MFLS COUPLED MODEL[J]. Acta Energiae Solaris Sinica. 2023, 44(5): 30-39 https://doi.org/10.19912/j.0254-0096.tynxb.2021-1450

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