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Discretisation

Check Static Model Visually Does it look like too much or too little? Make finer in regions such as touchdown, near solids, near step changes in the properties Make coarser in regions where little happens, deep water catenary suspended lengths for example. Discretisation. Why Worry?

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Discretisation

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  1. Check Static Model Visually Does it look like too much or too little? Make finer in regions such as touchdown, near solids, near step changes in the properties Make coarser in regions where little happens, deep water catenary suspended lengths for example Discretisation • Why Worry? • Too fine and the run takes longer • Too coarse and behaviour is missed or wrong

  2. Discretisation • Check Dynamic Model Visually • Are lines passing through solids, catching on the edge or failing to follow the profile? • Does the line seem to kink rather than curve • Are nodes bouncing on the seabed? • Check Results • Tension Time History: ‘Spiky’ or high frequency variation • Tension Range Graph: Euler limit infringed and high compression • Curvature Range Graph: Smooth variation

  3. Where to get information Message Box Statics Progress Window Out-of-Balance Loads (Shift+Ctrl+Y) Your eyes Statics Convergence

  4. What to look out for Object overshoot - more damping. @ Min 1-1.5, Max 10-100 in steps OR bad 1st guess Statically indeterminate Buoys - Check DofF or give an out-of-balance force Circling solution but never quite reaching it - increase tolerance (care!) Multiple dependent objects - fix some, run simulation, then save final positions. Then start again with all free. Statics Convergence

  5. If all else fails? Fix the objects and let it settle dynamically Contact us for help! Statics Convergence

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