COMSOL weak formulation -- CFD Online Discussion Forums

May 9, 2006, 20:16	COMSOL weak formulation	#1
Das Guest Posts: n/a	I want to use COMSOL package to solve time dependent Marangoni instability in 2D and 3D. Can anybody give me a lucid introduction to the weak formulation of the problem? I understand that I need to use a test function, but how to choose that test function (like u_test or T_test or uxx_test)? What is the origin and necessity of a Lagrange multiplier in the generalised Neuman boundary condition?

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