Hello, My name is Roberto. I'm currently a professor in the Applied Mathematics Department of Univ. of São Paulo at São Carlos. I'm working on some fluid-structure interaction problems in which the solid will be modeled as a 1D beam. Our reference integration domain will be the interval [0,L]. We are planning to use firedrake and Hermite elements. The problem is nonlinear. I already have a working example. Values degrees of freedom are easy to impose by using DirichletBC(), however I'm not figuring out how to enforce derivatives degrees of freedom as boundary conditions (let say at x=0), which I need for a clamped beam. Any help or trick would be appreciated Regards -- Roberto F. Ausas Instituto de Ciências Matemáticas e de Computação - ICMC/USP São Carlos, SP - Brasil *http://www.lmacc.icmc.usp.br/~ausas* <http://www.lmacc.icmc.usp.br/~ausas>