Kolja Westphal asked 2 years ago
Hello,
i would like to know if (and how) it is possible the change the analysis option: Fuselage-panels:ignored to Fuselage-panels:included.
I looked at your test files, and there, the option was set to ‘included’. However, if i run a normal analysis, this option is per default on ‘ignored’.
Hello,
Not sure that I understand the question. I’ve just checked and the option can be activated or deactivated.
André
Ok, and where can i do that?
In the analysis definition, “Method” tab, “Include the contribution of fuselage inviscid moments”.
André
That is not the option i would like to change. I have written to the info mailaddress and sent a photo of the option i want to change.
It’s a bug. The option is a leftover from xflr5 where the fuselage’s quad panels ought to be excluded from the results.
I’ll fix it shortly.
Thanks for reporting the bug.
André
Does this bug influence my results in any way? I have run now a couple analysis and it seems that flow5 randomly changes this option and after every change, i get different results.
Further, when the option is set to ‘included’, i get unrealisitc values for the neutral point and static margin (-241%).
The results shouldn’t change randomly from run to tun.
The option to ignore the fuselage panels in the evaluation of the moments is precisely included to avoid the unrealistic values of the pressure forces. These occur numerically where the wing and fuselage connect for two reasons. Firstly the local geometry is complex making it very difficult to evaluate numerically a local gradient of doublet densities. Secondly these are areas of high pressure gradients and likely high velocities which would be damped in a viscous analysis.
I’ll try to release a fixed version shortly.