Analysis Of Flow, Heat Transfer And Stress In Porous Media Based On ANSYS

Porous media heat transfer and process of flow have a close relationship to energy, space, geology, material, chemical, construction, environmental and life sciences, porous media heat transfer, flow and stress analysis are widely used in various subjects, including Soil Seepage Mechanics, Hydrogen Storage, Fuel Cell and other new energy areas.The basic equations of seepage flow porous media were deduced based on the darcy and conservation of mass in porous media, and heat stress model in porous media was introduced. The similarity between the Seepage and heat conduction theory was proved. Using the finite element software ANSYS as a platform,the program commands of Seepage were wrote by their second development tools-APDL language, the reliability and validity of the program were demonstrated through the example of Homogeneous dam.Then, the model of the proton membrane fuel cell porous electrode was given, the method of calculating on the wet stress and strain was proposed by ANSYS, according to the mathematical model of stress and strain, and heat stress of the membrane electrode was analyzed. The results showed that, in addition to the clamping force and the operating temperature of the assembly process, the relative humidity of Membrane played an important role, and the impact of wet stress was much greater than heat stress on the membrane. When given the clamping force 3.95μm, the maximum equivalent stress occurs in the edge part of the membrane, plastic stress became the main reason on affecting the fatigue damage. Membrane near channel changed larger in the thickness direction, mechanical failure would happen during the continuous cycle operation.Finally, the order flow process of the calculation of Seepage volume force were established based on the Seepage module,and Coupling analysis between Embankment dam Seepage and stress fields was proposed, basing on the relationship between flow coefficient and stress. The seepage field and coupled distribution of the Jinshandian tin smelting Hill tailings dam were calculated according to the coupling of order flow program. Coupling analysis found that if considering coupling, the seepage increased by about 2%compared to the separate calculation of the seepage, when considering the seepage, the total stress value increased by 10%to 20%than when only considering the stress separately. Backfill area of the mine collapse were analyzed in seepage and stress coupled field, and found that Seepage quantity through the tunnel boundary was 1.3×10-3m3/s/m, Infiltration line got down to-200 meters area result from constant drainage. If considering the coupling compared to not considering coupling, the value of the whole head was reduced totally, especially more evidently in the bottom of the region. The total value gradually reduced by the coupling coefficientβincreasing.