******************* 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. ******************* Hello everyone, I would like to follow up on a post from Wed Oct 13 02:46:37 BST 2021 titled “Noise Force Specification” that was made by another user. I am using the incompressible solver in Nektar++ 5.5.0 and trying to trigger the transition of a flow between two parallel plates (2.5D case) using noise forcing. However, it seems that the forcing is not activated at all, since the velocity component along the homogeneous spatial direction is zero up to machine epsilon. Therefore, no superposed disturbance is recognizable. I use the following lines within the CONDITIONS section of my session file: <!-- noise forcing --> <FORCING> <FORCE TYPE="Noise"> <WHITENOISE> 0.005 </WHITENOISE> <UPDATEFREQ> 10 </UPDATEFREQ> <NSTEPS> 5000 </NSTEPS> </FORCE> </FORCING> The value for the WHITENOISE parameter was also used by Stan back then. I tried varying it, with no effect. Does anyone know whether this is this the variance or the amplitude? Back then, the user wrote: I tried your suggestions, but came up with the same results (a laminar flow profile without any "noise"). However, theredoesn't seem to be a reply to that. It looks like the problem still exists. All the best, Alex