studio termico

[Morin]

Let's start.
bar 10 mm x 10 mm x 1000 mm

type of analysis : thermal static
thermal conductivity : 60.5 w/m/°c
specific heat (by following analysis) : 434 joule/kg/°c

boundary conditions:

See Annex
mesh: body sizing 5mm

Bar? What's the point?

I am studying the heat produced in braking on a disk. list my data:
- maximum diameter disc 1200 mm and minimum 650 mm
- disc thickness 50 mm
- c45 disc material reclaimed
- the circular crown on which it strips the ferodo has diameter max 1196 mm and minimum 708 mm
(clearly it is necessary to consider this crown on both sides of the disc)
- quantity of heat entering on each circular crown 1870500 w
- braking time 0.52 sec
- initial disk temperature 30 °c
- convective coefficient considered h=5 w/(m^2 k)

expected result: tempered disk about 400 °c
result obtained with fem: tempered disk about 1200 °c

is therefore evident the discordance obtained!

 

[eih64]

for the transient:

density: 7850 kg/m^3

the transient is exhausted in about 30000 sec ... we put as max time of simulation 50000 sec
See Annex

 

[volaff]

cmq i have solidworks 2010.
If you send me the model before the analysis and tell me what to do I can see what results it gives.

 

[eih64]

The point is that you questioned two versions of the code and did not question yourself.
try to make this patch test.. How much does it cost you?
If the numbers come back on this will mean something or not?

 

[volaff]

ps: By doing the analysis on a bar and comparing the result obtained with ansys (fem software) you will understand which of the two versions "difect"!

 

[Morin]

cmq i have solidworks 2010.
If you send me the model before the analysis and tell me what to do I can see what results it gives.

Okay. Sending the template by email? But you have cosmos? I went from solidworks 2007 to 2012 so I know little about 2010

 

[Morin]

... try to do this patch test.. How much does it cost you?
If the numbers come back on this will mean something or not?

Okay, how do I run the patch test?

 

[volaff]

Put the file here.
cosmos is here!
obviously you have to put the file version 2007 because 2012 to me would not read it

 

[Morin]

I attach the file in parasolid format to allow you to upload it.

 

[eih64]

Okay, how do I run the patch test?

You have everything you need.

 

[volaff]

I don't know nun cosmos. I don't know where to help.
I thought you would send me the model already loaded xd!

 

[Morin]

I don't know nun cosmos. I don't know where to help.
I thought you would send me the model already loaded xd!

Okay, I'll set up the model and send you everything.

 

[volaff]

cmq allow you to do the patch test as suggested previously.
You're gonna do a lot earlier, you know?

 

[Morin]

the file is large 36 mbyte, maybe it is a little too much.

 

[volaff]

then try to make the patch test. Better!
so comparing the result you will understand which software "pecca"!

 

[Morin]

I know that it is the new software to give me problems (solidworks 2012). rather I wanted to have confirmation on the result that it is not acceptable to me. I believe that the new version of 2012 compared to that of 2007 has many more options and therefore should be configured properly before performing a thermal analysis. the helpdesk at the moment not from reply given the period, therefore I confided in the forum.

 

[volaff]

dear morin the "connect" told you how to do it.
doing the same analysis with different software allows you to understand, comparing the results, if the output is acceptable or not.

 

[eih64]

I know that it is the new software to give me problems (solidworks 2012). rather I wanted to have confirmation on the result that it is not acceptable to me. I believe that the new version of 2012 compared to that of 2007 has many more options and therefore should be configured properly before performing a thermal analysis. the helpdesk at the moment not from reply given the period, therefore I confided in the forum.

This is a partial answer .. we are on the right path ..
the proposed patch test, given the extreme ease of the same, would allow you to verify that (this is what I think) between 2007 and 2012 does not change anything.
instead you have "encapsulated" on your model and on that you want to stay (with all the difficulties and pitfalls that the problem has).
I'm sorry for you, but the problems don't work out like that. take a step back (see patch test) and then return once you clarify each point on your problem.
at the same time such simple simulation would respond to one of your questions "I change the convective coefficient and the temperature is the same" or something similar ...
If you want to continue on your way go ahead ... if you are looking for help ... help

 

[volaff]

This is a partial answer .. we are on the right path ..
the proposed patch test, given the extreme ease of the same, would allow you to verify that (this is what I think) between 2007 and 2012 does not change anything.
instead you have "encapsulated" on your model and on that you want to stay (with all the difficulties and pitfalls that the problem has).
I'm sorry for you, but the problems don't work out like that. take a step back (see patch test) and then return once you clarify each point on your problem.
at the same time such simple simulation would respond to one of your questions "I change the convective coefficient and the temperature is the same" or something similar ...
If you want to continue on your way go ahead ... if you are looking for help ... help

Great!

 

[Morin]

This is a partial answer .. we are on the right path ..
the proposed patch test, given the extreme ease of the same, would allow you to verify that (this is what I think) between 2007 and 2012 does not change anything.
instead you have "encapsulated" on your model and on that you want to stay (with all the difficulties and pitfalls that the problem has).
I'm sorry for you, but the problems don't work out like that. take a step back (see patch test) and then return once you clarify each point on your problem.
at the same time such simple simulation would respond to one of your questions "I change the convective coefficient and the temperature is the same" or something similar ...
If you want to continue on your way go ahead ... if you are looking for help ... help

That's good.
strange that a solidworks technician noticed that by jumping 5 versions the software changes a lot. However on the patch test, once performed, no substantial differences (as obvious). Now the underlying problem is to understand what is wrong with my analysis but of course it can only help me who is practical with cosmos and has passed to solidworks 2012. thanks for the support! Good holidays.