Chapter 13

FieldConvert is a utility embedded in Nektar++ with the primary aim of allowing the user to convert the Nektar++ output binary files (.chk and .fld) into a format which can be read by two common visualisation softwares: Paraview (.vtu format) or Tecplot (.dat format). FieldConvert also allows the user to manipulate the Nektar++ output binary files by using some additional modules which can be called with the option -m which stands for module. Note that another flag, -r (which stand for range) allows the user to specify a sub-range of the domain on which the conversion or manipulation of the Nektar++ output binary files will be performed.

Almost all of the FieldConvert functionalities can be run in parallel if Nektar++ is compiled using MPI (see the installation documentation for additional info on how to implement Nektar++ using MPI). 1

 13.1 Convert .fld / .chk files into Paraview or Tecplot format
 13.2 Range option -r
 13.3 FieldConvert modules -m
  13.3.1 Smooth the data: C0Projection module
  13.3.2 Calculate Q-Criterion: QCriterion module
  13.3.3 Sum two .fld files: addFld module
  13.3.4 Concatenate two files: concatenate module
  13.3.5 Equi-spaced output of data: equispacedoutput module
  13.3.6 Extract a boundary region: extract module
  13.3.7 Compute the gradient of a field: gradient module
  13.3.8 Interpolate one field to another: interpfield module
  13.3.9 Interpolate scattered point data to a field: interppointdatatofld module
  13.3.10 Interpolate a field to a series of points: interppoints module
  13.3.11 Isoncontour extraction: iscontour module
  13.3.12 Show high frequency energy of the Jacobian: jacobianenergy module
  13.3.13 Print L2 and LInf norms: printfldnorms module
  13.3.14 Computes the scalar gradient: scalargrad module
  13.3.15 Scale a given .fld: scaleinputfld module
  13.3.16 Time-averaged shear stress metrics: shear module
  13.3.17 Boundary layer height calculation: surfdistance module
  13.3.18 Calculate vorticity: vorticity module
  13.3.19 Computing the wall shear stress: wss module
  13.3.20 Manipulating meshes with FieldConvert
 13.4 FieldConvert in parallel
 13.5 Processing large files