General CAELinux/Salome Questions
11 years 1 month ago #7445
by Brian Hale
General CAELinux/Salome Questions was created by Brian Hale
Hey all,
First. to all the people who helped make this software, THANK YOU!, I bow before your prowess,
I am new to the Linux/CAELinux and so far I am really liking it but I have some general questions. (if I need to break these into separate posts just let me know.)
1. Most big brand FEA software have a way to check for convergence of a solution, is there a way to do this in any CAELinux applications (eg. Salome)?
2. Has anyone done any kind of electronics cooling analysis using CAELinux, if so any suggestions on where to find help/tutorials?
3. In general FEA I am familiar with the term to add "mid-side nodes" and what adding them does, but in Salome what does it mean to "convert to quadratic" or are these synonymous.
4. In other big brand software there is the ability to generate a push button report that will list constraints, loads, mesh info, results, etc.. Does any CAELinux software have this ability?
And just so I am clear, non of these items are deal breakers for the software. If CAELinux doesn't do any of these it is still great software that I will continue to use, but as I am new to Linux, CAELinux, and french
I just wanted to make sure I am not missing anything.
Thanks for your time
First. to all the people who helped make this software, THANK YOU!, I bow before your prowess,
I am new to the Linux/CAELinux and so far I am really liking it but I have some general questions. (if I need to break these into separate posts just let me know.)
1. Most big brand FEA software have a way to check for convergence of a solution, is there a way to do this in any CAELinux applications (eg. Salome)?
2. Has anyone done any kind of electronics cooling analysis using CAELinux, if so any suggestions on where to find help/tutorials?
3. In general FEA I am familiar with the term to add "mid-side nodes" and what adding them does, but in Salome what does it mean to "convert to quadratic" or are these synonymous.
4. In other big brand software there is the ability to generate a push button report that will list constraints, loads, mesh info, results, etc.. Does any CAELinux software have this ability?
And just so I am clear, non of these items are deal breakers for the software. If CAELinux doesn't do any of these it is still great software that I will continue to use, but as I am new to Linux, CAELinux, and french
I just wanted to make sure I am not missing anything.Thanks for your time
11 years 1 month ago #7448
by Claus
Code_Aster release : STA11.4 on OpenSUSE 12.3 64 bits - EDF/Intel version
Replied by Claus on topic Re: General CAELinux/Salome Questions
Okay, I'll give it a shot and answer some of your questions:
1. Not as far as I know, but that does certainly not mean there aren't any. When you get to know the code, you will start to get a feel for for the validity of your solution and you will instinctively know when you wont gain anything more from mesh refinement.
What convergence criteria are you thinking of?
2. There are several thermal analysis packages in CAELinux, so take your pick
3. Yes, as far as I know, you can call them synonymous. There are variations of quadratic elements via Salome and/or via Code_Aster command file.
4. For Salome/Code_Aster unfortunately no. I not that familiar with the other software included though.
/C
1. Not as far as I know, but that does certainly not mean there aren't any. When you get to know the code, you will start to get a feel for for the validity of your solution and you will instinctively know when you wont gain anything more from mesh refinement.
What convergence criteria are you thinking of?
2. There are several thermal analysis packages in CAELinux, so take your pick
3. Yes, as far as I know, you can call them synonymous. There are variations of quadratic elements via Salome and/or via Code_Aster command file.
4. For Salome/Code_Aster unfortunately no. I not that familiar with the other software included though.
/C
Code_Aster release : STA11.4 on OpenSUSE 12.3 64 bits - EDF/Intel version
11 years 1 month ago #7449
by Brian Hale
Replied by Brian Hale on topic Re: General CAELinux/Salome Questions
WOW a reply from the great and powerful Claws! 
your tutorials and posts have been quite helpful to me thanks.
1. In Comsol and Ansys (for example) there is a plot that is generated when when you run your analysis and as long as the slope of that curve is negative (downward) toward a singular value (ie. converges in stead of diverges) then you are reasonably sure you have a good answer. Other than that I am really not too sure how it works or what it is doing. Currently I just keep decreasing the size of my mesh (increasing the number of nodes) and see if my solutions change, if they are within about 3% or less of each other I consider it to have converged. Right or wrong it is about the only method I have and it is pretty time consuming.
2. Can they all do CFD Heat Transfer? I thought most of them couldn't.
3. So in Salome mesh module, when I right click>convert to/from quadratic and do not check the create middle node flag and click convert, what is it doing?
4. Thats what I thought thanks.
your tutorials and posts have been quite helpful to me thanks.1. In Comsol and Ansys (for example) there is a plot that is generated when when you run your analysis and as long as the slope of that curve is negative (downward) toward a singular value (ie. converges in stead of diverges) then you are reasonably sure you have a good answer. Other than that I am really not too sure how it works or what it is doing. Currently I just keep decreasing the size of my mesh (increasing the number of nodes) and see if my solutions change, if they are within about 3% or less of each other I consider it to have converged. Right or wrong it is about the only method I have and it is pretty time consuming.
2. Can they all do CFD Heat Transfer? I thought most of them couldn't.
3. So in Salome mesh module, when I right click>convert to/from quadratic and do not check the create middle node flag and click convert, what is it doing?
4. Thats what I thought thanks.
11 years 1 month ago #7452
by Brian Hale
Replied by Brian Hale on topic Re: General CAELinux/Salome Questions
Keeswouters,
You have turned on two light bulbs but turned off one
(bad joke I know)
Your quadratic answer makes perfect sense. But then why do I get a warning stating "some nodes are not placed on geometry...." when I check "medium nodes on geometry"? I might have to go back and take a look at this.
I assumed it had something to do with the <CALCULEL_7> error I kept getting......I think i am more confused by my analysis now but thank you for the clarity of your answer.
I love the convergence check, but is that information something you only get when you do a non-linear analysis? I went back and checked my linear-static.mess file and I do not have a table of numbers like that. I do have a table but it looks like this:
Or it could just be that my analysis is that messed up!
You have turned on two light bulbs but turned off one
(bad joke I know)Your quadratic answer makes perfect sense. But then why do I get a warning stating "some nodes are not placed on geometry...." when I check "medium nodes on geometry"? I might have to go back and take a look at this.
I assumed it had something to do with the <CALCULEL_7> error I kept getting......I think i am more confused by my analysis now but thank you for the clarity of your answer.
I love the convergence check, but is that information something you only get when you do a non-linear analysis? I went back and checked my linear-static.mess file and I do not have a table of numbers like that. I do have a table but it looks like this:
PARTITION : 1
--------------------------------------------------------------------------------
CL- --NUM-- -MA- -----IADM----- -U- - LON UA - -S- ------------- NOM --------------
|G| 0| 0| 0| 9|X| 7438| X| <<<< LIBRE >>>>
| | 0| 0| 0| 7455|U| 250| D|
| | 0| 0| 0| 7713|U| 50| D|
| | 0| 0| 0| 7771|X| 123294| X| <<<< LIBRE >>>>
--------------------------------------------------------------------------------
OBJETS ALLOUES DYNAMIQUEMENT
--------------------------------------------------------------------------------
CL- --NUM-- -MA- ---------IADY--------- -U- - LON UA - -S- ------------- NOM --------------
|G| 0| 1| -2| 176694256|U| 11| D| ________GLOBALE ________$$CARA
|G| 0| 2| -2| 144075872|U| 4000| D| ________GLOBALE ________$$IADD
|G| 0| 3| -2| 141819872|U| 251| D| ________GLOBALE ________$$GENR
|G| 0| 4| -2| 141821968|U| 251| D| ________GLOBALE ________$$TYPE
|G| 0| 5| -2| 141839952|U| 1001| D| ________GLOBALE ________$$DOCU
|G| 0| 6| -2| 144107952|U| 2000| D| ________GLOBALE ________$$ORIG
|G| 0| 7| -2| 144124032|U| 8004| D| ________GLOBALE ________$$RNOM
|G| 0| 8| -2| 144188144|U| 2000| D| ________GLOBALE ________$$LTYP
|G| 0| 9| -2| 144204224|U| 2000| D| ________GLOBALE ________$$LONG
|G| 0| 10| -2| 144220304|U| 2000| D| ________GLOBALE ________$$LONO
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.Or it could just be that my analysis is that messed up!
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