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Problems with the results initial value of the solution is not equal to the initial boundary setting

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Dear Jean-Francois Hiller,

A pleasant day to you Sir.
I am currently doing a heat and mass transfer study to simulate the drying of rice grains. My geometry is composed of 186 pieces of ellipsoid structures placed inside a half cylinder.
The intent of this study is to monitor the reduction of moisture in the 186 pieces of grains.
The boundary condition set for the transport of the diluted species were set at 28 % moisture as the initial condition and 12 % moisture as the final condition.
The physics that I'm using is a couple of conjugate heat transfer and transport of diluted species.
The solution in the coupled analysis reached convergence.
However, when i did the volumetric integration of the concentration, the initial value of the solution is not equivalent to the initial boundary condition.
The solution predicted to have the initial concentration of around 22 %, not 28%.
I am attaching the mph file as as well as the Excel file for calculation of the concentration for you to have a look.

I am not so sure if I missed something in my setting causing the problem. Can you please help me out on how to solve this one?

Thank you very much.

Respectfully yours,

Jonathan Perez
Graduate student Kyushu University Japan

PS
The mesh size were remove to reduce the file size. Mesh sizes were set at fine for the grains inside the half cylinder, extra fine for the grains outside the cylinder and the cylinder was finer.

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