How to print dx value

mesh
1

Hi everybody,

I want to visualize the numerical value of the volume on which I compute the integral in order to compare with the hand-calculated.

I use dx volume and I can’t to visualize it’s numerical value in the python console.

2

Consider: print(assemble(1*dx(domain=mesh)))

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3

I obtain dx =6278670479.934861. this output hasn’t much sense, because my geometry consist in a cylinder with height =2m and radius = 2 m in which I’ve subtracted a sphere of radius 5cm then the volume must be equal to dx = 25,12m^3. What units of measure does fenics use?

4

FEniCS does noes use any units. Whatever unit you have consistently specified your mesh in, is the output unit.
i.e. If you define your external mesh in mm, say a rectangle that goes from [0,50]x[0,50] dolfin will print the area as
2500 (mm^2).
If you say that your input unit is meter in the external meshing tool, dolfin will still print 2500, but the unit will be m^2

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