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From: John Peterson <peterson@cf...>  20060202 17:28:19

Why not just send it directly to Roy's other email account? That is, if Roy wants to give it out :) John li pan writes: > Roy, if see this mail again, just delete it. I haven't > installed LaTex. I want to try with .rar this time. > > Hello all, > I have been worked with elastic problem for a long > time. My main work is to implement a non linear > elastic problem for an organ, for which I need a > energy function. Well, after several months fighting > with papers and dissertations of other researcher I > found one. I put this in the attachment because of the > expression in email. As I tried to test it with some > data, I can't get reasonable results. I implemented > this problem as quasistatic with incremental > solution. At each timestep system matrix and rhs will > be calculated with current displacement. Since it's a > non linear problem, I applied a Newtonmethod. But the > convergence was too bad. > Roy told me last time. There could be some thing wrong > with system matrix calculation. I checked it. Didn't > found anything. My question now is, > if the algorithm was implemented well, are there any > other reasons? For example, geometrical form, force, > element, anything. > > best > > pan 
From: li pan <li76pan@ya...>  20060202 17:23:09

Roy, if see this mail again, just delete it. I haven't installed LaTex. I want to try with .rar this time. Hello all, I have been worked with elastic problem for a long time. My main work is to implement a non linear elastic problem for an organ, for which I need a energy function. Well, after several months fighting with papers and dissertations of other researcher I found one. I put this in the attachment because of the expression in email. As I tried to test it with some data, I can't get reasonable results. I implemented this problem as quasistatic with incremental solution. At each timestep system matrix and rhs will be calculated with current displacement. Since it's a non linear problem, I applied a Newtonmethod. But the convergence was too bad. Roy told me last time. There could be some thing wrong with system matrix calculation. I checked it. Didn't found anything. My question now is, if the algorithm was implemented well, are there any other reasons? For example, geometrical form, force, element, anything. best pan __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com 
From: Roy Stogner <roystgnr@ic...>  20060202 16:00:17

On Thu, 2 Feb 2006, li pan wrote: > Would you please pass my following email to the > mailinglist. It's blocked because of the size of the > attached file(74k). thanx If it's blocking for you, it's not going to let me through either. Do you know how to typeset with LaTeX? You might try posting your file as raw .tex code; most of the people who can help you can read or "compile" LaTeX, and there's just no reason for one page of equations to take tens of kilobytes. > I have been worked with elastic problem for a long > time. My main work is to implement a non linear > elastic problem for an organ, for which I need a > energy function. Well, after several months fighting > with papers and dissertations of other researcher I > found one. I put this in the attachment because of the > expression in email. As I tried to test it with some > data, I can't get reasonable results. I implemented > this problem as quasistatic with incremental > solution. At each timestep system matrix and rhs will > be calculated with current displacement. Since it's a > non linear problem, I applied a Newtonmethod. But the > convergence was too bad. By "convergence was too bad", do you mean that you got subquadratic convergence approaching the root, or that your Newton iteration didn't converge at all? > Roy told me last time. There could be some thing wrong > with system matrix calculation. I checked it. Didn't > found anything. My question now is, > if the algorithm was implemented well, are there any > other reasons? For example, geometrical form, force, > element, anything. "Pure" Newton's method only works if you have bounded Jacobians near the root and if your starting iterate is in the region of convergence of the root you're looking for. If one of those isn't true, you'll have to modify Newton somehow; a common method is to use the fact that Newton gives descent directions, and take halfsteps, quartersteps, etc. in the Newton direction until you find a point at which your nonlinear residual is reduced. This can give poor convergence rates until you get near the root, but it's more reliable. If you're not getting quadratic convergence even when you're near the root, then something else is likely wrong. Any finite element mistakes which would give you an underdetermined system for linear problems can also give you bad convergence for nonlinear ones, but usually the problem is just a mistake in the Jacobian calculation.  Roy 
From: Paulo Correia <pcorreia@ue...>  20060202 12:35:39

Hi, I want to map the solution data to a MeshFunction object by doing MeshFunction dataFunc = MeshFunction (equation_systems, vec, dof_map, 0); but I receive the following error message myLibStokes.C: In function `int main(int, char**)': myLibStokes.C:201: cannot allocate an object of type `MeshFunction' myLibStokes.C:201: because the following virtual functions are abstract: /home/paulo/libmesh0.5.0/include/numerics/function_base.h:83: virtual void FunctionBase::clear() myLibStokes.C:201: cannot declare variable `alphaMeshFunc' to be of type `const MeshFunction' myLibStokes.C:201: since type `const MeshFunction' has abstract virtual functions Can anyone tell the correct way of doing it? Thanks pc 