September 11, 2019 at 9:16 pmWeiqiang LiuSubscriber
I am doing a 2D transient simulation of porous media combustion which is similar to packed bed combustion with fluent. At this point, I can get everything right except velocity contour.
In my model, I just assumed porous media is composed by spherical particles fixed in space. With the consumption of porous media, the diameter of particle is decreasing.
My question is how can I model the shrinkage of the porous media layer? For example, the porous layer thickness is decreasing with soot oxidation. However, I don't have dynamic mesh to describe this boundary movement. I am wondering can I just define some mass exchange between adjacent cells to model this shrinkage or compaction phenomenon?
September 12, 2019 at 5:31 amDrAmineAnsys EmployeeYou can adjust porosity and resistances wuth your porous media based on oxidation rate or any input. If packed bed porous media alternative to use granular model with heterogeneous reactions.
September 12, 2019 at 1:58 pmWeiqiang LiuSubscriber
yes, I tried to define a resistance function which is related to porosity and local soot concentration. Normally, resistance is decreasing with consumption of soot. However, seems like the resistance is decreasing either too slow or too rapidly.
Therefore, I am thinking about if I need to use shrinkage model. Because I read this in some fixed bed combustion paper, those authors modeled mass and enthalpy exchange between adjacent cells to mimic porous layer compaction.
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