Comments on: Whole System Statics http://www.orcina.com/blog/whole-system-statics/ Orcina Ltd. discussing all things OrcaFlex Mon, 17 Oct 2011 08:52:52 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: David Heffernan http://www.orcina.com/blog/whole-system-statics/comment-page-1/#comment-73 David Heffernan Sun, 25 Apr 2010 11:02:34 +0000 http://www.orcina.com/blog/whole-system-statics/#comment-73 Senthil, It's hard to say what's going on here without seeing your input file. If you e-mail it to us then we'll take a look. Cheers, David. Senthil,

It’s hard to say what’s going on here without seeing your input file.

If you e-mail it to us then we’ll take a look.

Cheers, David.

]]> By: dskumar http://www.orcina.com/blog/whole-system-statics/comment-page-1/#comment-72 dskumar Sun, 25 Apr 2010 08:20:01 +0000 http://www.orcina.com/blog/whole-system-statics/#comment-72 Dear David I'm encountering a new problem with one of the input files. It's something like this, I ran an input file > saved its simulation (and also it's input) > closed Orcaflex > then opened the input file later to show it to my colleague > but this time, though it says "statics complete", it shows a different profile. The file is typically a catenary check with an umbilical passing over a chute. What I try to say by different profile is that, this time, it slides out of the chute (which is not a proper modeling) whereas initially it showed a smooth profile passing along the radius of the chute (which I had saved). Then I got a new thought. I opened the simulation file (that had the smooth profile), pressed "F12" so that now the simulation file is a "data" file. I ran it in the same window, but it again showed the umbilical with the improper profile. Can you please get back to me on this and advise as to what could be the reason for this? Cheers Senthil Dear David

I’m encountering a new problem with one of the input files. It’s something like this, I ran an input file > saved its simulation (and also it’s input) > closed Orcaflex > then opened the input file later to show it to my colleague > but this time, though it says “statics complete”, it shows a different profile. The file is typically a catenary check with an umbilical passing over a chute. What I try to say by different profile is that, this time, it slides out of the chute (which is not a proper modeling) whereas initially it showed a smooth profile passing along the radius of the chute (which I had saved).

Then I got a new thought. I opened the simulation file (that had the smooth profile), pressed “F12″ so that now the simulation file is a “data” file. I ran it in the same window, but it again showed the umbilical with the improper profile.

Can you please get back to me on this and advise as to what could be the reason for this?

Cheers
Senthil

]]> By: David Heffernan http://www.orcina.com/blog/whole-system-statics/comment-page-1/#comment-13 David Heffernan Mon, 22 Oct 2007 17:26:13 +0000 http://www.orcina.com/blog/whole-system-statics/#comment-13 Caspar, WSS has a single tolerance value that applies to all DOFs (nodes, buoys etc.) So if it reports "statics complete", then as I understand it all DOFs will have met the tolerance. Is it possible that the problem was caused by not all buoy DOFs being included in statics? Anyway, if you can still find the problem file then I'd appreciate it if you could e-mail it to us so that we can investigate. Cheers, David. Caspar,

WSS has a single tolerance value that applies to all DOFs (nodes, buoys etc.) So if it reports “statics complete”, then as I understand it all DOFs will have met the tolerance. Is it possible that the problem was caused by not all buoy DOFs being included in statics? Anyway, if you can still find the problem file then I’d appreciate it if you could e-mail it to us so that we can investigate.

Cheers, David.

]]> By: Caspar Heyl http://www.orcina.com/blog/whole-system-statics/comment-page-1/#comment-12 Caspar Heyl Mon, 22 Oct 2007 13:16:58 +0000 http://www.orcina.com/blog/whole-system-statics/#comment-12 I noticed recently that Whole System Statics will report "Statics Complete" even though some of the tolerances are not met. As a result of this, my simulation was becoming unstable at the first time step. It turned out that one of the lines was not converging. Since I was running in batch it took me quite a while to figure out what was going on. If I had used Separate Buoy and Line statics, I would have been able to see that the static analysis failed. Caspar Heyl I noticed recently that Whole System Statics will report “Statics Complete” even though some of the tolerances are not met. As a result of this, my simulation was becoming unstable at the first time step. It turned out that one of the lines was not converging. Since I was running in batch it took me quite a while to figure out what was going on. If I had used Separate Buoy and Line statics, I would have been able to see that the static analysis failed.

Caspar Heyl

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