The Results Available for SPH Elements
The results available for SPH elements
SPH elements write out the following block of 18 values per element to the .PTF file:
- Radius of influence (1 value, used to determine its size when drawn)
- Pressure (1 value)
- Stress tensor (6 values)
- Plastic strain (1 value)
- Density (1 value)
- Internal energy (1 value)
- Number of neighbours (1 value)
- Strain tensor (6 values)
Experience suggests that the above data components are written regardless of any flags on *DATABASE_EXTENT_BINARY or other control cards.
The following tables show the raw data component names, and also those derived by D3PLOT.
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This is written in the global cartesian coordinate system.
The stress components that can be derived this by D3PLOT are:
Effective plastic strain |
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The effective plastic strain is always output, as above. It has no intrinsic direction.
Directional strain tensorUnlike other element types this strain tensor is written unconditionally, regardless of the value of STRFLG on the *DATABASE_EXTENT_BINARY card. |
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And the strains derived from these by D3PLOT
Further SPH-only components |
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It is not clear why PRESSURE is written separately, rather than being deduced from the stress tensor. D3PLOT uses this value rather than (Sx + Sy + Sz) / -3.0 |
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| VOLUME (from radius) | ||