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2 models results comparison

62 Views, 5 Replies
01/12/2018 10:25 PM

I have a situation that looks weird to me. 

 

I simulated the temperature variation of 40 vs 180 steel rolls in a vessel(not sure correct term), starting at 650°C and ending at an "X value" temperature.

 

The strange thing is(at least i think it is), that the model with 180 rolls cooled down faster and finished the simulated time at a lower temperature.

 

Is this physically correct? Maybe its just me who does not understand that much about physics. Any coment about this would be much apreciated. 

 

I have atached both support files in case you would like to take a look at them.

 

Best regards,

 

Ivan Tijerina.

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Message 1 of 5 ( Views: 62 )

Re: 2 models results comparison

01/12/2018 10:46 PM

I imagine it is because the more steel rolls creates more air intake in my inlets and therefore making them colder than the 40 rolls.

 

But still, a confirmation that this is the reason would be awesome. 

 

Or maybe somthing diferent? Hopefully i have not simulated this in a incorrect manner.

 

Regards,

 

Ivan Tijerina.


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Message 2 of 5 ( Views: 55 )

Re: 2 models results comparison

01/15/2018 10:37 AM

Hi Ivan,

 

Your theory of higher air intake at the p=0 inlets for the 180 model due to buoyant effects sounds like a good one.

 

Why not check the flow rates at the inlets using the bulk calculator and compare with the 40 roll model? 

 

All the best,

David


David Short
Technical Support Specialist, Simulation

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Message 3 of 5 ( Views: 39 )

Re: 2 models results comparison

01/15/2018 3:24 PM
Hi David, 
I tried with bulk calculator, it did show diferent values, lower un the 40 roll model. Its my first attempt at using the bulk calculator so im not sure if there is a way for me to reduce the area of calculation. Q: Is there a way to rededuce or specify a diferent area to calculate with bulk?
What i did before was check the velocity with traces, it showed higher intake in the 180 roll model.
Regards,

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Message 4 of 5 ( Views: 37 )

Re: 2 models results comparison

01/16/2018 8:38 AM

Hi Ivan,

 

Sounds like you are onto something then! 

 

Once you have positioned your bulk calculator it will calculate the average values on each continuous surface. Unfortunately you cannot specify a particular section of a continuous surface to investigate however I feel that average values of each entire inlet surface should prove useful.

 

All the best,

David


David Short
Technical Support Specialist, Simulation

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