A similar expression can be obtained for

If the mesh is not too distorted,

and

and

(16.6)

or,

(16.7)

or,

(16.8)

Therefore (16.4) becomes

(16.9)

and (16.5) becomes

(16.10)

Now, the first two terms of (16.3) can be evaluated as

(16.11)

 

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