## You are here

# convergence

## An efficient convergence test for the fixed point method

Wed, 2018-11-07 13:10 - mohammedlamineThe fixed point method consists to find the solution of F(X)=X.

One can not get fixed with the convergence condition |F'(X)|<1 because if the function has an optimum then |F'(X)|=0 even if the solution is not yet reached.

We introduce an efficient convergence test with the condition:

|Xn+1 - Xn| ≤ epsilon1 And |F(Xn+1)-Xn+1| ≤ epsilon2

- Read more about An efficient convergence test for the fixed point method
- mohammedlamine's blog
- Log in or register to post comments
- 785 reads

## Converged, but to the right solution??

Tue, 2014-11-18 08:57 - setarehHello eveybody,

I am confused in using numerical schemes: What can convergence of a numerical scheme tell us and what not??? lets assume that a numerical scheme does converge to "A result" or "A number", but how could we be sure that the scheme has actually converged to the "RIGHT solution" and not a WRONG one??

Any input is appreciated!

Setareh

- Read more about Converged, but to the right solution??
- setareh's blog
- Log in or register to post comments
- 902 reads

## ABAQUS Reinforced Concrete Beam Model

Wed, 2014-01-08 12:06 - UWStructEngHi All,

I am trying to model a simply supported reinforced concrete beam with longitudinal reinforcement. I am using 8-node solid elements for the concrete, and 2-node truss elements for the longitudinal reinforcement bars. I have embedded the reinforcement bars in the concrete using an Embedded Region constraint. I am then applying a displacement at the midspan (deflection control). I am using the Concrete Damaged Plasticity model for the concrete. My model begins to run but will not converge. Some of the error messages that I get are:

- Read more about ABAQUS Reinforced Concrete Beam Model
- Log in or register to post comments
- 6716 reads

## ABAQUS Convergence problem while using CREEP subroutine

Tue, 2013-12-17 05:08 - ehsan.hosseini@...- Read more about ABAQUS Convergence problem while using CREEP subroutine
- ehsan.hosseini@empa.ch's blog
- Log in or register to post comments
- 4751 reads

## Journal Club Theme of August 2012: Mesh-Dependence in Cohesive Element Modeling

Sat, 2012-08-04 00:33 - Julian J. Rimoli- Read more about Journal Club Theme of August 2012: Mesh-Dependence in Cohesive Element Modeling
- Julian J. Rimoli's blog
- 12 comments
- Log in or register to post comments
- 24905 reads

## Reg. Convergence and Mesh Density

Wed, 2009-09-09 10:03 - shrimadHi

I am using a FORTRAN FE code for 4 quad elements with a viscoelastic material and with contact analysis. The routine follows a Newton Raphson iteration scheme and which makes the residual zero for convergence. I am using direct sparse matrix solver from the FORTRAN math library.

- Read more about Reg. Convergence and Mesh Density
- 1 comment
- Log in or register to post comments
- 4123 reads

## Numerical phase modeling of BTO nanostructure using Landis' model with FEAP

Wed, 2009-07-08 05:01 - aquis_mechThe difference to the common model used is the f,g terms. The 3D FEM formulation has been derived and a new fortran program is written. The derivative matrix is symmetric. But the calculation result does not converge. I have tried every means to get a converging result. But it doesn't work, the residual norm always increases.

- Read more about Numerical phase modeling of BTO nanostructure using Landis' model with FEAP
- aquis_mech's blog
- Log in or register to post comments
- 3319 reads

## Recent comments