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The apex of the sub-element while calculating the volume of a polyhedron is ____________

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The apex of the sub-element while calculating the volume of a polyhedron is ____________

(a) its centre of mass

(b) its centre of gravity

(c) its centroid

(d) its geometric centre

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This interesting question is from Types of FVM Elements in chapter Finite Volume Methods of Computational Fluid Dynamics

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The correct option is (d) its geometric centre

The explanation: First, the geometric centre of the polyhedron is located. This is the apex of the pyramid. The distance of this apex from the face of the element gives the height of the pyramid. From the base and height of the pyramid, its volume is calculated.

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