Numerical Simulation of Heat-Transfer in Fracture Rock Based on Fluid-Solid Coupling

By analyzing the heat-transfer and seepage of fracture rock, the coupling model of heat-transfer is developed. Temperature field distribution of fracture rock is described by using heat-transfer differential equation. At the same time, the heat-transfer equation is discretized by using weighted residual Galerkin finite element. Combined with boundary condition and parameters, the numerical solution is obtained. The results of numerical simulation show that the heat transportation resulted from fracture flow has major impact on the temperature field distribution of fracture rock. Under the action of fracture flow, the difference in temperature of water and rock wall is gradually reduced. Heat-transfer is increasing as the increase of the velocity of seepage, and the time of reached thermal equilibrium is cut down. The rate of temperature isoline is decreased along the fracture flow. The fluid-solid coupling had evident effects on temperature field distribution of fracture rock, and fluid temperature may influence temperature gradients. The contrast of flow velocity and fluid temperature shows that the effect of the former to temperature field distribution is bigger.