Comments (4)
Actually it seems that the x
and y
coordinates given in the cog
argument have no influence on the results.
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Looking at this a bit more, here's my current understanding:
stiffness: I think there was a bit of a problem here, which I've submitted a fix for with #22 (note however that what I've done is not yet propagated back to the Hydrostatics
class; if you think it looks good we can finish doing this).
hydrostatics: these look like they are currently calculated relative to a point on a vertical line passing through origin but with the correct vertical position:
This section uses the x and y location of the origin (xi, yi = polyverts[0, :2]
)
meshmagick/meshmagick/hydrostatics.py
Lines 605 to 621 in 0d214f9
This section uses the vertical location of the cog (self.zg
)
meshmagick/meshmagick/hydrostatics.py
Lines 653 to 655 in 0d214f9
Thus, it might be appropriate to change this method so that it calculates based on COG, right?
meshmagick/meshmagick/hydrostatics.py
Line 599 in 0d214f9
This line would be changed to polyverts = clipper.clipped_crown_mesh.vertices[polygon] - self._gravity_center
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related to #1
from meshmagick.
I just released v3.0 which should fix these issues.
Note however that I have totally refactored the hydrostatics module using only functions with no class. The code is far more simple and the number of lines of code has lowered.
The stiffness matrix and metacentric stuffs are now expressed on a line passing though COG/buoyancy centre.
Positions such as buoyancy centre are expressed in the initial frame. It allows to directly compare results to other commercial software such as Maat Hydro.
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Related Issues (20)
- mistake in the cog calculation with shell inertia HOT 10
- Test is failling on master branch HOT 2
- NaN normals when writing mesh object to stl file HOT 3
- Converting - extension "dat" not found HOT 2
- Issue writing .DAT file (Diodore). HOT 1
- How to install for Python 3.7? HOT 1
- Python 3 implmentation and documentation HOT 2
- Hydrostatics for fully submerged body. HOT 4
- Getting Python error when calling meshmagick.hydrostatics.Hidrostatics() HOT 2
- Impossible to use CLI HOT 8
- ModuleNotFoundError: No module named 'meshmagick_cli' HOT 11
- conda/pip installation issues HOT 6
- Meshmagick not running with Anaconda HOT 2
- Meshmagick Hydrostatic Issue HOT 2
- load_GDF ValueError HOT 1
- Converting a mesh file HOT 7
- ModuleNotFoundError: No module named 'gmshparser' HOT 1
- Request for Assistance: Generating KH.dat and Hydrostatic.dat Files with Meshmagick
- gmsh v4 HOT 17
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