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-   -   What if my simulation results are far from experiment data? (http://www.cfd-online.com/Forums/cfx/116024-what-if-my-simulation-results-far-experiment-data.html)

yanxiaoxu April 11, 2013 07:47

What if my simulation results are far from experiment data?
 
What if my simulation results are too far away from experiment data?
Or what can I do to make my simulation more closer to the real experiment? My mesh quality is ok, is there any parameters in CFX that I can change to calibrate my simulation, or modify the model? if there is, how could I do ? Thanks!

Lance April 11, 2013 08:17

http://www.cfd-online.com/Wiki/Ansys..._inaccurate.3F

RicochetJ April 11, 2013 09:16

Quote:

Originally Posted by yanxiaoxu (Post 419850)
What if my simulation results are too far away from experiment data?
Or what can I do to make my simulation more closer to the real experiment? My mesh quality is ok, is there any parameters in CFX that I can change to calibrate my simulation, or modify the model? if there is, how could I do ? Thanks!

How do you know your mesh quality is OK? Be careful with changing parameters in CFX. If you don't fully understand what a parameter or constant does it can have severe adverse effects during the calculation process and could give misleading results.

I recommend you go through your entire setup back to basics:
- Check to see if your geometry is correct
- Check to see if your mesh is well resolved for pertinent flow features
- Check to see if your boundary conditions are correctly setup
- Check to see if you're using the "correct" turbulence model (if you're using one)
- Check to see if you're missing out certain physics. For example you need to turn radiation on if it's significant

Unless you've double, triple and quadruple checked everything and have the utmost confidence that everything is setup correctly then I would only consider playing around with stuff like turbulence constants, expert parameters etc.

Good luck.


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