Hello.
For same principle of barge and environment condition,
I found that there were difference between analysis condition 1 and condition 2.
$/////////////////////////////
condition 1. (for draft 6m barge)
&instate -locate barge 0 0 -2 0 0 0
hydrodynamics
g_pressure barge
end_hydrodynamics
condition 2. (for draft 6m barge)
&instate -locate barge 0 0 -6.2 0 0
&equi
$use &equi to set draft.
freq_response barge
sresponse sea
fr_point ...
end
st_point sea
$//////////////////
This 2 condition shows different result, i thought this difference occur from different amount of panel printed from g_pressure command.
Which one is proper usage of command? I thought condition 2 is proper because it generate panel of entire barge.
If 2 conditions above were wrong, how can i use command g_pressure?
Best regard.
Hi Hyunjoong,
Thank you for posting your question.
For condition 1, the origin of the body is located at 0, 0, -2 and the pressures are computed based on this position; but it is at the 0, 0, -6.2 in condition 2. We should expect different results from different configurations. This is what I can see from the commands you posted. If you want me to take a close look at your inputs, please raise a service request through our webpage.
Best regards,
Bitna
Hello Bit-na,
Thanks for your answer
I understand your qoute 'We should expect different results from different configurations.'.
when i calculate motion of the barge under specific environmental condition(wind+wave+current) though command 'sresponse',1. Set the barge at equalized draft by using '&equi', then use 'g_pressure' to compute pressure.2. Set the entire barge submerged under the sea, use 'g_pressure' to compute pressure, then '&equi' to set the barge equalized draft.
Different sequence of the command generate different result, i want to know which one is proper sequence to calculate motion of the body?
Hyunjoong,
This is about an engineering decision.
The different orders of commands place a vessel in a different position; you then get different pressure database. If you think the difference is negligible, either is fine, but it is too large to proceed, you need to choose one of them based on the characteristic of your system and the type of analysis you need to do. There is no rule of thumb. It depends on you.
I understood your explain.
Since the result of 2 condition shows significant difference, i could not determine which one is proper result of analysis.So i have inquired you whether there were standard or proper way of usage of command.
If there were no rules or standard, i want to 'raise a service request' you recommended.But i can not find where can i raise a service request.
Please let me know.
best regards.
If you are using any kind of MOSES Applications such as MOSES Executive, go to Support -> Resources and click Service Request Manager. You can raise a service request there. Please let us know if you need further assistance.
Best regards.