Is it a difficult & challengin CFD simulation case
I will forward here a simulation problem: 
There are two zones (say,left and right zones) separated by a wall. (1) The flows in left zone is combustion of solid fuel which will provode heat through the wall to the right zone. It can be defined as the twophase CFD probelm. (2) After getting the heat from the left zone, the material in the right zone starts to melt. so, the flow in the right zone involves phase change with the capture of interface. Therefore, the global problem in my case is two sets of CFD models. The former is slightly compressible flow, and the latter is incomressible flow with the movement of phase interface.  What is your opinion for the complex simulation case by using FLUENT? Please help me to find out somesolution methods... Sarwa 
Re: Is it a difficult & challengin CFD simulation
FYI:
This is exactly a problem the MUSES, Multiply Shared Space Method, has been invented for. The most recent application of the technique has been published in Numerical Heat Transfer, 2005. Look for the paper by S.B.Beale and S.V.Zhubrin " A Distributed Resistance Analogy for Solid Oxide Fuel Cells", Numerical Heat Transfer, Part B, 47, pp.573591, 2005. Hope you find the paper informative enough to pick up (and implement) the main idea. Good luck. Best regards Sergei Zhubrin 
Re: Is it a difficult & challengin CFD simulation
I have solved a similar problem by breaking the problem into two parts. Solve one of the parts, say the combustion first. This will give you a profile for the heat transfer rate across the wall. This will be equivalent to an adiabatic wall. Now solve the next part, say the melting. Use the heat transfer that you obtained from the first part and apply it as a profile. The wall must be common in both geometries and have the same corresponding grid points to make it easy (or else you will need to interpolate) Each time you will find the combustion side temperature and apply that as a profile boundary condition. Then find the melting side temperature and apply that as a boundary condition to the combustion side. Iterate these two problems till you have reached a sufficiently converged solution

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