Good morning,
I'm running a quasi-static mooring analysis in Moses and the wind is the only load I'm assuming. I'd like to understand something more about the wind result.
In the report I read the status results, something like that:
QUOTE
+++ M E A N F O R C E S A C T I N G O N T M I +++ ========================================================= Process = DEFAULT: Units = Degrees, Meters, M-Tons, and MPA Unless Stated Results Are Reported In Body System Type of Force X Y Z MX MY MZ------------------ --------- --------- --------- --------- --------- ---------Weight -0.12 0.01 -3000.00 0 -135000 -1Buoyancy 0.12 -0.01 2999.97 0 135035 1Wind -2.77 -0.00 0.01 0 -45 0Inertia 2.13 -0.44 -0.03 1 5 12Flex. Connectors 0.64 0.44 0.06 -2 6 -12 ======= ======= ======= ======= ======= =======Total -0.00 0.00 0.00 0 0 0
UNQUOTE
What I'd like to know is:
-How can I understand the point where the wind is acting?
-How can I read the windage area (for any angle of attack)?
Can anybody help me please?
Here attached a .rar file containing .cif and .dat files.
Thanks
Pietro
2474.TEST.rar
Hi Pietro,
Nice to hear from you.
The following commands will report the areas in the body x, y and z plane. This will include a center for each panel. In your model the cargo has one panel in each face. This makes the table easy to read. For more detailed models the number of panels will increase and the table will grow.
&summarycompart_SUM properties panelsend
There is not a command to report the windage area for any angle of attack. You are reporting the wind force for heading 0. You will have to back calculate the area from this report.
Please keep in mind the command ¶meter -af_environment. That will change the way the wind force is used.
I hope this helps.
Georgina Maldonado
Hi Georgina,
It is a pleasure hearing from you.
Thanks for your advice. Let me say I'm a little bit surprised that MOSES doesn't report the windage area; anyhow, I'm using
and I'm rotating the model (in .dat file) any 45 degrees.
Do you think that's could be an "effective way" to read the windage area?
There is a nightly test that changes the environment direction then reports the force. The resulting data is used in the verification document. Please see win_cur files in the following directory.
C:\Program Files\Bentley\Engineering\MOSES CONNECT Edition V12\hdesk\runs\samples\verify
It is the c_shapes macro that gathers this data. You can add a line to divide the force by velocity^2. Then you are left with the other variables in
F = 1/2 * rho * coef * A * vel^2
Georgina
Sorry for the late reply, that's because I passed through the macro. Well, I think it is very interesting and I'll try to adapt the same for what I need. thanks for your advice.
Anyhow, do you think I could get the same result rotating the module in the .dat file?
Attached is a file set with name area_sample. This reports the heading the area in the x direction and the area in the y direction in the log file. The sample body is a square box.
Please have a review and let me know your questions.
area_sample.zip