studio termico

[Morin]

Hello, I ask you a question before the holidays:
"is there a difference three a thermal study carried out with cosmos of solidworks 2007 and another carried out with solidworks 2012? "

 

[eih64]

Hello, I ask you a question before the holidays:
"is there a difference three a thermal study carried out with cosmos of solidworks 2007 and another carried out with solidworks 2012? "

I don't think that's possible. Why this question?

 

[Morin]

After the update of solidworks, the thermal studies carried out with the new module (solidworks 2012) have disagreements with those of the previous version (cosmos - solidworks 2007) and with what is expected. Moreover, there is no variation of the result to the variation of the convective coefficient.

 

[eih64]

After the update of solidworks, the thermal studies carried out with the new module (solidworks 2012) have disagreements with those of the previous version (cosmos - solidworks 2007) and with what is expected. Moreover, there is no variation of the result to the variation of the convective coefficient.

seems to be a bug. make a copy of the material and change the convective coefficient ... then run again and see what happens

 

[Morin]

nothing changes and the problem persists! Finally, if I carry out the analysis with a more or less dense mesh, it changes many orders of magnitude the final temperature.

 

[Morin]

I would like to point out that the procedure for the study with the two versions is identical.
the operations carried out only those below:
- realisation of the model,
- definition of the material,
- definition of thermal transient,
- assignment of the bond sizes,
- creation of mesh
- Starting the analysis.

 

[eih64]

I would like to point out that the procedure for the study with the two versions is identical.
the operations carried out only those below:
- realisation of the model,
- definition of the material,
- definition of thermal transient,
- assignment of the bond sizes,
- creation of mesh
- Starting the analysis.

Thermal transient?
Stop everything.

proceed with a simple stable -state thermal and check the results.
correctly determines the thermal "map"

 

[Morin]

Forgive me eih64 but could you be clearer?

 

[eih64]

Forgive me eih64 but could you be clearer?

speak of thermal transient. So this is analysis over time?
to verify the problem parts from a simple static thermal analysis.
Basically. make a simple geometry simple. apply a temperature and a convection and see what comes out. change at that point the convective coefficient and raise.

 

[Morin]

Perhaps the reference to another discussion can make me understand better what I meanhttp://www.cad3d.it/forum1/showthread.php?t=32791However this time the probemes are two:
- difference between the results obtained with cosmos - solidworks 2007 and solidworks 2012
- constant temperatures to vary the convective coefficient (ref. old discussion)

 

[volaff]

do you not want to verify the "vericity" of the solution using another software and comparing the results with the two versions of solidworks?

 

[Morin]

changes only the version of the software and however the result of the analysis should differ little and do not pass from 400 °c to 1400 °c or more!
I'm sorry to fly, but I disagree.

 

[volaff]

I agree that it should differ little, but using a different software for comparison one could understand between the two versions as "stona".

 

[eih64]

changes only the version of the software and however the result of the analysis should differ little and do not pass from 400 °c to 1400 °c or more!
I'm sorry to fly, but I disagree.

if so proceed with a report to the support for obvious bugs on the software.
But if you allow me, first I would proceed with the classic "patch test".
You want to do it with me?
comparative test with ansys...

 

[Morin]

I have just done the same analysis by changing only the mesh.
case 1) global size (mesh) 20 mm, implies a temperature of 1362 °C
case 2) global size (mesh) 18 mm, implies a temperature of 1216 °c

Who can explain why? the final temperature of the disk should not differ much.

 

[Morin]

if so proceed with a report to the support for obvious bugs on the software.
But if you allow me, first I would proceed with the classic "patch test".
You want to do it with me?
comparative test with ansys...

Why not?

 

[Morin]

I agree that it should differ little, but using a different software for comparison one could understand between the two versions as "stona".

volaff but do you think solidworks 2007 and solidworks 2012 are different software?

 

[eih64]

Why not?

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

 

[eih64]

static thermal results

See Annex

 

[volaff]

volaff but do you think solidworks 2007 and solidworks 2012 are different software?

speak on the assumption that solidworks was born as cad 3d and then various "packages" were added.
what I was referring to is to understand whether one of the two "stools" so as to avoid its use if it gives "inconsistent" results.

Maybe the 2012 version is more "complete" than in 2007.