Fluids

Fluids

Diffusion in lattice structures using lattice boltzmann or simular

    • sohoem
      Subscriber

      Hello,


      I need to simulate the diffusion (permeability) of hydrogen, water and co2 in a gass diffusion layer in a hydrogen fuel cell. The goal is to find the coefficient of diffusion. The plan is to use darcy's law to calculate the coefficient of diffusion. Therefore I need to know the pressure drop and flow across the gss diffusion layer. 


      The gass diffusion layer is going to be modelled as a quibic lattice structure and some triply peridoc minimal surfaces structures in varying sizes and compare them together to see which structure that shows the best performance. The unitcells will be in the size range of 50-100 micrometers and are going to be modelled in increasing size: 1 unit cell, 2x2x2 unit cells, 3x3x3 unit cells, 4x4x4 unit cells and so on....untill I find a representative volume element.


      I have read that a lattice boltzmann solver is the best approach to model microscopic flow/diffusion. The problem is that I can't see that ANSYS as a built in lattice boltzmann solver. What is the best practice for obtaining the best results with ANSYS that can be compared(simular) to lattice boltzamnn? 


      Thanks!


      -Svenn Ove Hoem

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