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#161 | |
Senior Member
Matthew
Join Date: Mar 2022
Location: United Kingdom
Posts: 178
Rep Power: 4 ![]() |
Quote:
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#162 |
Senior Member
Matthew
Join Date: Mar 2022
Location: United Kingdom
Posts: 178
Rep Power: 4 ![]() |
As you can see a lot of the issues I've had have gone away after my rather crude fix the issue at h=0 is now working. The issue is now twofold: The value at h=1 seems to be erratic. I use a stress-free condition at h=1, but there still seems to be a spike.
The other issue is about parametrisation. |
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#163 |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,830
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How do you introduce the Neumann BC into the scheme?
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#164 |
Senior Member
Matthew
Join Date: Mar 2022
Location: United Kingdom
Posts: 178
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#165 |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,830
Rep Power: 73 ![]() ![]() ![]() |
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#166 | |
Senior Member
Matthew
Join Date: Mar 2022
Location: United Kingdom
Posts: 178
Rep Power: 4 ![]() |
Quote:
This is graph is for the edges, rather than the cells. I used interp1 in Matlab to obtain the values, and I got a NaN at h=0 for some reason. |
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#167 |
Senior Member
Matthew
Join Date: Mar 2022
Location: United Kingdom
Posts: 178
Rep Power: 4 ![]() |
I have the majority of the problems sorted but one issue I think is the length of the rod in question. The way I calculate it is by using the mass in each cell as being constant. and if dh represents the mass of a typical cell, then I use:
![]() where dX represents the new length after compression. The new cell locations are then given as Code:
X=[0 cumsum(dX)] As you can see, it hasn't gone down much and I wondered if this was the code or just a poor choice of parameters. |
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finite volume method |
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