How to extract the net reaction rate of ch4 from the fluent?

ChenZhan · October 15, 2014, 05:03

Dear everyone, thanks for your attention.
Recently, i am studying the eddy dissipation concept model (EDC model) in the fluent help. And a particular parameter, net reaction rate or reaction source term, is very concerned for me. I want to extract it from the calculated results, yet i am not success. Can you give me some suggestion? Here, some questions are listed following:
1. Is there a special model macro which can do this work by fluent itself;
2. If no such macro exists, how to do this work.
3. If we use the fluent help, for instance, with equation 7-30 in the theory guide of fluent, why it can not provide a consistent result when i compare it with the fluent reports. Is there a discrepancy between the net reaction rate and reaction rate term appearing in the equation 7.1, i.e. the result calculated by equation 7-30.
Any help will be very appreciated for me, thanks, good luck,my frieds.

pilakin · October 21, 2014, 08:38

You can activate additonal output values in Solution->Run Calculation->Data File Quantities
Maybe what you're looking for is in there?

ChenZhan · October 22, 2014, 02:04

Thanks,pilakin.
The calculation has been carried over, so i do not want to take it again. Alternatively, i want to used the UDF together with the script function to extract net reaction rate out of the results. The most difficult for me is that it is not accertain to get the result of net reaction rate calculated by fluent. In the fluent help, it provides 2 reference on the EDC model, yet none is completely consistent with that presented in the help document. I am really very confused for that which formular used in the fluent code. In addition, it is not very clear what is the difference between the net reaction rate and the reaction source term. In my opinion, they should be same with each other. In other words, if i used the formular 7-30 in help document to calculate the reaction source term, it should be equal to that presented by the fluent :Result=>Reports. However, in fact, they are not the same. Why, i can find the answer. If i obtain the formular for net reaction rate used by fluent, so it is convenient to output this result with my UDF in the form of batch mode.
Thanks, againe.

ChenZhan · November 23, 2014, 22:33

If you have a better understanding of this subject, please help me.Thanks my friends. Any suggestion will be very appreciated.

October 15, 2014, 05:03	How to extract the net reaction rate of ch4 from the fluent?	#1
ChenZhan New Member Small Mayi Join Date: Nov 2011 Posts: 26 Rep Power: 14	Dear everyone, thanks for your attention. Recently, i am studying the eddy dissipation concept model (EDC model) in the fluent help. And a particular parameter, net reaction rate or reaction source term, is very concerned for me. I want to extract it from the calculated results, yet i am not success. Can you give me some suggestion? Here, some questions are listed following: 1. Is there a special model macro which can do this work by fluent itself; 2. If no such macro exists, how to do this work. 3. If we use the fluent help, for instance, with equation 7-30 in the theory guide of fluent, why it can not provide a consistent result when i compare it with the fluent reports. Is there a discrepancy between the net reaction rate and reaction rate term appearing in the equation 7.1, i.e. the result calculated by equation 7-30. Any help will be very appreciated for me, thanks, good luck,my frieds.

October 21, 2014, 08:38		#2
pilakin New Member Join Date: Sep 2014 Posts: 12 Rep Power: 11	You can activate additonal output values in Solution->Run Calculation->Data File Quantities Maybe what you're looking for is in there? ChenZhan likes this.

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October 22, 2014, 02:04		#3
ChenZhan New Member Small Mayi Join Date: Nov 2011 Posts: 26 Rep Power: 14	Thanks,pilakin. The calculation has been carried over, so i do not want to take it again. Alternatively, i want to used the UDF together with the script function to extract net reaction rate out of the results. The most difficult for me is that it is not accertain to get the result of net reaction rate calculated by fluent. In the fluent help, it provides 2 reference on the EDC model, yet none is completely consistent with that presented in the help document. I am really very confused for that which formular used in the fluent code. In addition, it is not very clear what is the difference between the net reaction rate and the reaction source term. In my opinion, they should be same with each other. In other words, if i used the formular 7-30 in help document to calculate the reaction source term, it should be equal to that presented by the fluent :Result=>Reports. However, in fact, they are not the same. Why, i can find the answer. If i obtain the formular for net reaction rate used by fluent, so it is convenient to output this result with my UDF in the form of batch mode. Thanks, againe.

November 23, 2014, 22:33		#4
ChenZhan New Member Small Mayi Join Date: Nov 2011 Posts: 26 Rep Power: 14	If you have a better understanding of this subject, please help me.Thanks my friends. Any suggestion will be very appreciated.