CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   STAR-CCM+ (http://www.cfd-online.com/Forums/star-ccm/)
-   -   about the validation of Star ccm for supercritical water (http://www.cfd-online.com/Forums/star-ccm/112096-about-validation-star-ccm-supercritical-water.html)

htwana January 22, 2013 02:52

about the validation of Star ccm for supercritical water
 
Did anyone ever successfully use starccm to simulate the heat transfer performance of supercritical water within round tube?

htwana January 23, 2013 00:47

It seems very few people use star ccm in this field

McKOG November 7, 2014 07:01

Quote:

Originally Posted by htwana (Post 403467)
It seems very few people use star ccm in this field

Hello, did you successfully simulate it? Since I am working on the same topic as yours, but I cannot put the right thermodynamic properties into the software.

htwana November 7, 2014 09:38

Quote:

Originally Posted by McKOG (Post 517892)
Hello, did you successfully simulate it? Since I am working on the same topic as yours, but I cannot put the right thermodynamic properties into the software.

I was told by the technical support of IDAJ that the starccm is not designed for the supercritical fluid, and it can not deal with the drastically changed physical properties of supercritical fluid. However, in the region far away from the pseudo-critical point where the physical properties do not change rapidly, the calculated results (heat transfer coefficient) meet the emprical formula, such as D-B and Watts, well.

I suggest you use fluent or cfx to deal with the problem of supercritical fluid, just like what I am doing now.

McKOG November 7, 2014 09:59

Quote:

Originally Posted by htwana (Post 517907)
I was told by the technical support of IDAJ that the starccm is not designed for the supercritical fluid, and it can not deal with the drastically changed physical properties of supercritical fluid. However, in the region far away from the pseudo-critical point where the physical properties do not change rapidly, the calculated results (heat transfer coefficient) meet the emprical formula, such as D-B and Watts, well.

I suggest you use fluent or cfx to deal with the problem of supercritical fluid, just like what I am doing now.

Thanks for your reply! Well, I found one example from your previous post, and I followed your example and I got the good result. However, I have not checked the result with the empirical formulas. If they share a huge gap, I think I will choose Fluent.

Besides, there is a problem within your simulation that the thermodynamic property input is quite complex. Because you chose the polynomial density input, but I do not how to generate the polynomial density curves for my case. Can you show me how to do that?

By the way, from your name, are you Chinese?

htwana November 7, 2014 10:13

Quote:

Originally Posted by McKOG (Post 517918)
Thanks for your reply! Well, I found one example from your previous post, and I followed your example and I got the good result. However, I have not checked the result with the empirical formulas. If they share a huge gap, I think I will choose Fluent.

Besides, there is a problem within your simulation that the thermodynamic property input is quite complex. Because you chose the polynomial density input, but I do not how to generate the polynomial density curves for my case. Can you show me how to do that?

By the way, from your name, are you Chinese?

First, I use program of steam-water property to get enough data for curve fitting. Then I use the function of originpro to fit the curve under certain pressure, such as 25MPa.
In originpro, the path to fit curve is as follows:
Analysis-fitting-fit polynomial

McKOG November 7, 2014 11:56

Quote:

Originally Posted by htwana (Post 517921)
First, I use program of steam-water property to get enough data for curve fitting. Then I use the function of originpro to fit the curve under certain pressure, such as 25MPa.
In originpro, the path to fit curve is as follows:
Analysis-fitting-fit polynomial

But if you can get the steam-water property data, why not use the tabular input directly? Since I find table input also works well. Have you checked the table input in STAR ccm?

Besides, I also checked some literatures which used STAR ccm+ to conduct their simulations, I don't know if they check the simulation results by comparing the results with empirical formulas. It seems it is possible to utilize STAR ccm to conduct the simulations.

Kind regards,

McKOG


All times are GMT -4. The time now is 03:39.