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Both single and double precision versions of FLUENT are available in workbench. Although single precision is sufficiently accurate in most cases, the disparate length scale in our model (long, thin pipe) may create large round-off error. Hence, we will use double precision to reduce this error.

Axis SymmetricAxisymmetric

When Axis Symmetric Axisymmetric is selected, FLUENT transforms the Cartesian coordinates to cylindrical polar coordinates. The gradient in the axis symmetric model now becomes:

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