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#1 |
New Member
Shahin
Join Date: May 2020
Posts: 12
Rep Power: 6 ![]() |
Hi everyone
I have a problem which happens to me rather often. After running simulations (usually not very complicated ones, in report section when I use "Stream Line" for velocity, my stream lines start at inlet but in the way to the end they become less and less and finally I will not have any streamline representations. Does it mean my results are not accurate? (my simulations usually converge up to 10^-4) |
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#2 | |
Member
mCiFlDk
Join Date: Feb 2020
Posts: 60
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Quote:
I don't know properly why does it happen, but in CFD post the option to plot streamlines always worked properly for me. Have a try and share your answer to know if it worked for you. Regards. |
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#3 | |
Senior Member
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Quote:
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Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority. |
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#4 |
New Member
Shahin
Join Date: May 2020
Posts: 12
Rep Power: 6 ![]() |
Yes, they become less and less as we move from inlet to outlet, it means that streamlines stops where between inlet and outlet.
Can you please tell me what do you mean by increasing the steps? are you referring to number of iterations (if that is so I have already increased the number of iterations and it did not work) I was suspecting that maybe the residuals are too large and my model is not converged! (my residuals are in order of 10^-4 for continuity and 10^-5 for velocities. The simulation is about the flow of CO2 inside a serpentine channel (should be supper easy!) Here are some pictures from my results, if they help! |
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#5 |
Senior Member
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Iterations are for continuous flow. You need to increase steps, shown on the Pathlines panel. Default would be 500.
__________________
Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority. |
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#6 |
New Member
Shahin
Join Date: May 2020
Posts: 12
Rep Power: 6 ![]() |
well in the version I am working with, for controlling the streamlines there is an option named "max point" by which I can increase the number of streamlines. Is it the same as steps you are referring to? if not can you address me a bit more accurately where this pathlines panel and step are? (they are in results right?)
By increasing this number from 25 to 1000 it helped extending the streamlines a bit but as you can see there are too many of them and the problem is not still solved. Also, do you believe this could be due to a bad convergence and wrong results or you think it just a problem in representation? |
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#7 |
Senior Member
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You are not using Fluent, but CFDPost. The control in CFDPost is not straightforward, I suppose under Limits (or Symbols) tab.
__________________
Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority. |
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#8 |
New Member
Shahin
Join Date: May 2020
Posts: 12
Rep Power: 6 ![]() |
Thanks mate
I used Fluent and the problem is solved and all the stream lines are contentious, just wondering why it happens in CFD post, the tabs you referred to are just for customizing and do not actually increase the length of the steam lines. It helped me a lot already Thanks |
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#9 |
Senior Member
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In CFDPost, increase the Max Time under Limits tab.
__________________
Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority. |
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Tags |
report, report files, streamline, velocity |
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