TAGGED: acceleration, aqwa
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May 30, 2024 at 4:55 pm
NVN NAMMA
SubscriberHiÂ
I have simulated a hollow cylinder for hydrodynamic analysis. I did physical experiments on the same model. calculated viscous damping and gave as an additional damping in aqwa. when i tried to validate the experimental and numerical results, the trend is seen with actual acceleration and the magnitude is matching with rao based acceleration. how to handle this . Any explanation will be highly useful.
2. when i calculated displacement from acceleration using fft code it was not matching with the aqwa displacements.
3. how aqwa calculates actual response?
4. how displacements and accelerations are related in aqwa?
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June 4, 2024 at 10:00 am
Shuangxing Du
Ansys Employee(1) Please see Aqwa theory manual, Section 13.5.3 Motions at Drift and Wave Frequency, the RAO based motion, velocity and acceleration are given by
Â
in which the irregular waves are represented byÂ
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(2) For actual acceleration calculation, the predictor-corrector algorithm is employed, and the raditation forces is caluclated by the impulse function convolution,
the velocity and position is then calculated by
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June 5, 2024 at 10:18 am
NVN NAMMA
SubscriberThank you so much sxdu for the reply.
 I saw the documentation on RAO based and actual acceleration and motion parameters.
What is the major difference in the RAO based and actual acceleration? .
For an experimental validation which one should i consider? I had kept a sensor on the top of the model with moonpool. I used nodal displacement after creating a connection point and fixed point on the top.. The RAO based values are matching with the magnitude and actual shows the trend.
2. For a regular wave analysis in aqwa naut, why small irregularities are seen in the result'
This is from the user manual. Can i have more explanation on the high lighted part
NB. model is in moored condition with cables
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