******************* This email originates from outside Imperial. Do not click on links and attachments unless you recognise the sender. If you trust the sender, add them to your safe senders list https://spam.ic.ac.uk/SpamConsole/Senders.aspx to disable email stamping for this address. ******************* Hi, I want to report a bug in "mean" module of FieldConvert for the 2.5D case. There is an issue in the computation of integral which comes from the error in the computation of "Domain volume". I am taking a test case for channel flow "ChanFlow_3DH1D_FFT.xml." Here Lx = 1, Ly = 1, Lz = 1. So the volume should be 1. But the output depends upon the number of Fourier modes. Below is the output with Nz = 20. ------------------------------------------- Domain volume : 20 Integral (variable u) : 7.14583 Mean (variable u) : 0.357292 Integral (variable v) : 6.25 Mean (variable v) : 0.3125 Integral (variable w) : 5 Mean (variable w) : 0.25 Integral (variable p) : 10 Mean (variable p) : 0.5 ------------------------------------------- and this is one with Nz = 40. ------------------------------------------- Domain volume : 40 Integral (variable u) : 14.2292 Mean (variable u) : 0.355729 Integral (variable v) : 12.5 Mean (variable v) : 0.3125 Integral (variable w) : 10 Mean (variable w) : 0.25 Integral (variable p) : 20 Mean (variable p) : 0.5 --------------------------------------------- Now, by changing the number of Fourier modes the "Domain volume" and "integral" should not change. However, the value of "mean" is correct; thus it seems there is some normalization issue. Similarly, I can see a discrepancy in the "innerproduct" module as well. I have also attached the xml file for the reference. With regards Abhishek --------------------------------------------------------------------------------------- Abhishek Kumar Assistant Professor (Research) Centre for Fluid and Complex Systems Coventry University, Coventry CV15FB The United Kingdom Phone: +44 24 7765 9150 ---------------------------------------------------------------------------------------