DVcurl

Synopsis

compute the curl of a vector field

module DVcurl {
Mesh+Node_Data+Iparam &in { /* input field */
nnodes+req;
xform+nonotify;
coordinates+req;
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 curl_update<status=1> =
"DVcurl_update";
};

Description

DVcurl computes the curl of a vector field with any mesh type.

Input

&in

The input is a reference to a field with any mesh type. The Node_Data must have one or more 3-vector components.

comp

An integer. Sets which component's curl to compute. The selected component must be a 3-vector.

Output

out_nd

This output is a new Node_Data object. It contains one 3-vector float component at each node that represents the curl.

&out

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.

Algorithm

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:

Example

Libraries.Main.Filters.curl

File

v/dv.v

modules/curl.c

See also

DVdivrg

DVgrad

DVmagnitude