compute the curl of a vector field
group DVcurl {
Mesh+Node_Data+Iparam &in {
nnodes+req;
xform+nonotify;
coordinates.values+req;
};
int+Iparam comp;
Node_Data+write+nonotify out_nd;
Mesh+Node_Data+nonotify+OPort2 &out => merge(out_nd, in);
method+notify_val+notify_inst upd_curl = "curl";
};
DVcurl computes the curl of a vector field with any mesh type.
The input is a reference to a field with any mesh type. The Node_Data must have one or more 3-vector components.
An integer. Sets which component's curl to compute. The selected component must be a 3-vector.
This output is a new Node_Data object. It contains one 3-vector float component at each node that represents the curl.
This output is a new object that is the merge of the new out_nd Node_Data plus a reference to the original input field.
The algorithm used to compute the curl in structured meshes is a finite difference approximation based on a central difference scheme. For unstructured meshes, the function is based on the cell shape functions and their derivatives.
In both cases, where the input is the vector function
The equation used to compute the curl is:
