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How to properly set the G parameter in GRAV bulk data entry?

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I have been confused by the parameter G in GRAV bulk data entry. I think this parameter is the acceleration of gravity. If I use the unit system of “kg, N, mm, MPa”, Should the parameter G be set to 9810 ? I found that If I set  G to 9810, the displacement of the structure in the case of gravity  is too large.


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