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How to write Nabla function in comsol 3.4

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Hello,
Can anyone tell me how to write nabla function in comsol 3.4? What is the syntax for this function? I wanna use it for dielectrophoresis and there is a term where I need to find the gradient of the electric field. So if anyone can help me with that it would be highly appreciated. Thank you.

Tasrif

1 Reply Last Post 3 dic 2012, 14:24 GMT-5
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)

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Posted: 1 decade ago 3 dic 2012, 14:24 GMT-5
Hi

there is no shortcut, from my reminder (neither not in v4) you must write out the components, check the doc on derivative variables and variables names, the fist and second order derivative of the dependent variables are defined within COMSOL, and exist if you have at least 2nd order discretization of your mesh elements

--
Good luck
Ivar
Hi there is no shortcut, from my reminder (neither not in v4) you must write out the components, check the doc on derivative variables and variables names, the fist and second order derivative of the dependent variables are defined within COMSOL, and exist if you have at least 2nd order discretization of your mesh elements -- Good luck Ivar

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