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Error in multiple domain 3D simulation of thermal transfer NITF

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Hello Sir Henrik,
I am trying to model the heat and mass transfer a layer of cereal grains. At the moment I am still doing the thermal transfer and hopefully soon the mass transfer.
The modeling of the thermal transfer went smoothly when i tried the 100 pieces of grains. However, an error occured when i increased the number of grains to 120.
I tried doing union in all the grains, but still an error will occur. It wont reach convergence.
Maybe you have some better ideas on how I can fix this and I am attaching the files so that you can have a look. The files are quiet big, so i linked it through this.
1. www.4shared.com/file/UWKs_Swx/...rains_in_stack_100_PIECE.html?
2. www.4shared.com/file/VbziqfKB/...rains_in_stack_120_PIECE.html?

Thank you so much in advance.

Regards,
Jonathan

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