Running Jetstream

This page will describe how to perform a basic steady RANS flow solve using Jetstream. It will introduce you to the basic workflow, input files, and input parameters required to run a simple case. Some more complicated cases, e.g. optimization are described on other pages.

Input Files

The input files required depends on the type of case being run, e.g. flow solve, optimization, etc. In the simplest case of a flow solve, the following files are needed:

• Grid file: Typically called grid.g. This is a multiblock PLOT3D format binary file containing the locations of all grid nodes.
• Grid connectivity file: Typically called grid.con. This describes how the blocks are connected to each other, and which block faces correspond to certain boundary conditions, e.g. solid surface, symmetry plane, farfield, etc. Some more information on the connectivity file is given below.
• Input file: Called input.param. This contains all of the Jetstream inputs to specify the type and behaviour of a run.
• Run script: A scheduler submission script. This is described here.

Grid Connectivity File

Grid connectivity files are typically generated either using ICEM and the convert_connect utility, or with the create_connect utility. See a lab member for info on these scripts. Below is a portion of an example connectivity file to illustrate the various entries.

• Number of blocks: The number of blocks in the multiblock grid.
• Number of subfaces: The number of number of faces. This includes block interface faces and boundary faces.
• Number of interfaces: The number of block interfaces, i.e. a face shared between two blocks across which information must be passed.
• Face: The face number. Two lines of entries for a given face number correspond to an interface face, with each line containing information about the two block faces which are joined.
• Type: This specifies the type of face. Typical face types include:
  • 0 = interface
  • 1, >100 = solid surface, with 101 = wing, 102 = tail, 103 = fuselage, 100 = solid face for boundary condition imposition but with no force calculation
  • 2 = far-field
  • 3 = symmetry plane (flow tangency)
• Blk: The block which is owner of a face
• Side: Identifies which coordinate face corresponds to the face
  • 1 = minimum i, 2 = maximum i
  • 3 = minimum j, 4 = maximum j
  • 5 = minimum k, 6 = maximum k
• it[1,2]: The coordinate direction along each face edge.
• itbegin[1,2]: The index of the starting node. 1 if index increases along edge, itnum[1,2] if index is decreasing along edge (together with negative it[1,2])
• itnum[1,2]: The number of nodes on each face edge.