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modify equation

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hello
in wave eq module there is the equation ea.utt= f + c.grad^2 (u)

It is possible to assign values and variables to that "f" in the equation
for example f=1 or f=t (that is f = time)

I wonder how can I assign to f the expression grad( grad.( u ) )
I mean, what exactly should I write in the gap of f value in order to assign it that expression

where grad is the nabla operator in 2D
note that is grad(grad.u) and not grad. grad( u )



Thanks

1 Reply Last Post 2012年7月25日 GMT-4 13:52

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Posted: 1 decade ago 2012年7月25日 GMT-4 13:52
any help? :s
any help? :s

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