Check your mesh quality first. If you grid is hexa, most likely the divergence is caused by the poor quality of the skewed hexa cells.
cset,news,fluid
chec,cset,,righ,news
(chec,cset,,negv,,news)
(chec,cset,,warp,80,news)
To fix these cells, try improving these cells using commands like vsmooth, elleptic smooth (?), unwarpr ,etc. Or you can simply delete the -d cells and leave cracks in your model. That way at least you can continue the calculation.
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