thank you for answering,
what I am trying to do is first of all replicate Mostapha video 4 on Butterfly (https://www.youtube.com/watch?v=0auA5exoL9M) using the example file you guys provided, to have a first working file and move on from there. Because I installed the latest version of BF, there were some components which I had to update (e.g. automatic grading etc), and I did some other things that I noted in capital letters on the file attached, e.g. detached the refinement grid as per your post to Devang. Not sure if those are causing this or what else, I am now pretty stuck…
Not sure what you mean with the vector velocity part of your answer please…?
Re the folders in the case folder, thay are created until the end but number 1 is not created when the snappy mesh runs, as it is shown on the video, nor I see such a refinement grid around the buildings as I see on the video.
Here attached is the file, few images and the link to my other post where I moved this topic: SnappyHex mesh doesn't seem to work
Many thanks. Viola
180702_01_0_outdoor_airflow_VM2.gh (529.8 KB)