Module category: Tools

• DerivOperators
  • Parameters
  • Input Ports
  • Output Ports
  • Examples

DerivOperators

DerivOperators works out gradients of scalar fields, or the divergence or curl of vector fields.

DerivOperators is available for all COVISE versions on all supported platforms.

Parameters

Name	Type	Description
whatToDo	Choice	Options: Gradient: Gradient of a scalar field Divergence: Divergence of a vector field Curl: Curl of a vector field Gradient Magnitude: Magnitude of the gradient of a scalar field

Input Ports

Name	Type	Description
requiredInGrid	UnstructuredGrid	input grid
requiredInData	Float Vec3	input data

Output Ports

Name	Type	Description
outputOutData	Float Vec3	output data

Examples

Figure: covise/net/examples/DerivOperators.net

In this example we use data sets from the tutorial. We read in an unstructured grid, a scalar field defined on the nodes (pressure), and a vectex-defined vector field (velocity). In the map we are using two DerivOperator modules in order to calculate and display the gradient of the pressure and the curl of the velocity field. Note that different from the majority of modules, the output of DerivOperators is defined per cell instead of per vertex. As the CuttingSurface module requires vertex-defined data, we have to resort to the CellToVert module in this case.

Below we produce the pressure gradient on a cutting surface and the curl of the velocity field on the same surface.

Figure: Pressure gradient

Figure: Rotational of the velocity