On 12/02/2016 09:30 AM, [email protected] wrote:
Thanks very much for your help and support. I do really appreciate your time
and know you are really busy. The fact is that my code ran just for the first
time step and can not solve for the other time step. when I refine the global
mesh twice, this problem happened, however, with increasing the number of
global refine mesh, the whole geometry is distorted. In fact, it is a
thermo-elastic problem which I should use two different Neumann B.C for the
curved side of my domain. I just want to know whether applying this type was
true or not. In addition, could you please help me more how I should use
load-following algorithm in dealii? It should be noted that I have multiplied
the Neumann magnitude by time-ramp (current_time/time_step). Looking forward
to hearing from you.
Benhour -- it is practically impossible to help you with this question. You
mention the following topics:
* It is a time dependent problem
* There is adaptivity
* There seems to be mesh movement
* The geometry seems to be distorted
* It is a thermo-elastic problem
* There seem to be different boundary conditions
* There seem to be curved boundaries
* The boundary conditions are modified in some time dependent way
* There is mention of a "load-following" algorithm
These are 9 concepts, in 9 lines of text, all without any kind of elaboration.
In other words, we have no real idea what you are doing, and equally
important, we have no idea what is actually wrong. When debugging problems
like yours, you need to learn to reduce things to the minimal case that shows
the problem, and to look for the *first sign* where something seems to be
going wrong. In your case, if you know that the mesh is distorted, it is no
surprise that you cannot solve. So *why* is the mesh distorted? Have you
inspected the mesh before and after you move it? Have you inspected the
solution of the first time step that is presumably used to move the mesh?
These are the questions you need to ask yourself.
Best
W.
--
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Wolfgang Bangerth email: [email protected]
www: http://www.math.colostate.edu/~bangerth/
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