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Quantitative verification of real casts
requires simultaneous measurement versus time of:

· Hand movements at the rod handle (rotation and translation).

· Hand movement hauling/feeding line.

· Rod and line positions.

Also, rod, line and fly data must be known
with sufficient accuracy (diameter, mass per unit length and bending
stiffness). Currently, no complete set of data that can be used for
verification of a complete cast exists to my knowledge.

From a simulation perspective the
uncertainties to be verified, may be summarized as follows:

• Is the model correct / is reality described by the equations?

– Equations of motion (Newtons equations), YES!

– Kinematic equations, YES!

– Bending behavior of line and rod. Approximate.

– Air drag is based on experimentally determined equations. Approximate.

• Are the equations solved correctly?

– Extensively checked, YES!

Verification is currently pursued as follows:

· Quantitative verification on parts, see examples on fly rod
below.

· Animated casts are evaluated to agree qualitatively with
observations.

· Around 25 test cases have been derived. These test cases
represent simplified (but relevant) situations for which exact solutions can be
derived. Numerical results obtained by the simulation model are compared with
exact solutions. The test cases verify that the equations are solved accurately
(verifying that the numerical scheme is 2^{nd} order accurate), see
examples below.

· Sensitivity analyses on input data that have not yet been
verified quantitatively.

**Quantitative verifications:**

Static verification of fly rod

Dynamic verification of fly rod

**Test cases verifying that
equations are solved accurately**