LOAD_SURFACE_SMOOTHING
Loads
"Optional title"
coid
entype, enid, $t_{dec}$
Parameter definition
Description
This command is used to smooth spatial variations in the surface normal velocity. The smoothing is done on element face level by applying artifical normal accelerations to the face nodes.
$\displaystyle{a_i = \frac{\bar{v} - v_i}{t_{dec}}}$
Here $a_i$ is an artificially applied normal acceleration increment to local face node $i$, $\bar{v}$ is the mass weighted average normal velocity of the face and $v_i$ is the normal velocity of node $i$. Note that (edge and corner) nodes can be shared by multiple element faces and, hence, receive more than one acceleration increment.
Example
Smoothing the explosive-liner interface in shaped charge application
Contact interfaces at extreme pressures and accelerations are highly sensitive to small variations in the mass distribution. Discretization errors, especially when using tetrahedron elements, can lead to non-physical surface distortions. Surface smoothing can be applied to reduce such unwanted effects.
The command below shows the effect of surface smoothing in a shaped charge application.
