what does this mean? \nabla ^3U


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Thanks,
You mean its a scalar rite? Actually its a simple version of the regular one. Its an equation of a turbulence model. "Partialaveragebased equations of incompressible turbulent flow" I attach a image. This equation is tough to handle. Right now I have no idea how to solve this equation. 

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I think is a simbolic power of the operator l.Grad therefore it must be applied n times on the function 

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