Why in a CFX-5.7.1 output file, is the imbalance for an equation large even though all the residuals are small?

If, for any equation, the residual is low but the global imbalance is high, it is generally a sign that the timescale for that equation is too small.
You can set individual timescales for each equation in CFX-Pre on the Solver Control form. Select the Equation Class Settings tab to set parameters for individual equations.
Select the equation you want from the list and tick the box below the list.

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