the geometry definition in cavity 2d problem

[Pulauwin]

Hello:
The dimension of the lid 2d is (0,1), I don’t understand why we need include “eps” in the definition. could you please help me out.

Vector<T,2> extend( T( 1 ) + 2*eps, 2*eps );
Vector<T,2> origin( T() – eps, T( 1 ) – eps );
IndicatorCuboid2D<T> lid( extend, origin );
// Set material number for lid
superGeometry.rename( 2,3,1,lid );

[mathias]

Due to rounding errors (working with douple), we need to extant the domain in order to capture the lid entirely!

[Pulauwin]

Does it has something with the implementation of boundary conditions. can I replace “eps” with other values?

[mathias]

This is just for the renaming of material numbers. No, dont relpace it because it should not be too big. By it you make sure that only the lid material numbers are renamed.

[Author]

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