For structured grids, this keyword block allows a point-by-point surface temperature boundary condition to be used, and/or point-by-point boundary layer transition information to be specified. Surface temperature and transition data may be specified for any boundary surface in any zone. [Note, though, that although Wind-US allows temperature/transition data to be specified on any boundary surface, the tmptrn utility used to add the data to the .cfl file currently does not allow specification on the i₁ or i_max surface.] The maximum total number of temperature/transition surfaces, combined, is determined by the Fortran parameter MAXTTS, currently equal to 20.

The normal procedure is to do an initial run, perhaps with just a few cycles, without specifying temperature/transition information, to create an initial common flow (.cfl) file. The temperature/transition data is then created and added to the .cfl file using the tmptrn utility.

For backward compatibility with early versions of Wind, however, the temperature/transition data may be read from separate ASCII files, one for each applicable surface, created with the older tmptrn utility. This would only be necessary during the initial (i.e., non-restart) run, since Wind-US will automatically store the data in the .cfl file, where it can be read during subsequent runs.

In addition, in earlier versions of tmptrn, the temperature written into the .cfl file was in K, instead of being non-dimensionalized. This error was fixed in version 1.8 of tmptrn. However, some versions of Wind-US had coding to accomodate the dimensional temperature value, and these versions will not work with temperature distributions written using tmptrn 1.8 and above. See the tmptrn documentation for details.

The various elements of the TTSPEC keyword block are defined as follows:

TYPE {TEMPERATURE | TRANSITION}

This keyword indicates whether a surface temperature distribution or boundary layer transition information is being specified.

MODE {FILE filename | CURRENT}

This keyword specifies where the surface temperature or transition data is stored.

	FILE filename		The data is stored in the ASCII file filename, created using the older tmptrn utility distributed with early versions of Wind. If filename is specified without an extension, an extension of .dat is assumed. This option is included for backward compatibility only, using existing files created with the older tmptrn utility, and is only needed for an initial (i.e., non-restart) run. Subsequent (i.e., restart) runs should use MODE CURRENT. New applications should use the latest tmptrn utility to write the temperature/transition data into the .cfl file directly.
	CURRENT		The data is stored in the flow (.cfl) file.

ZONE zone_number

This keyword specifies the number of the zone containing the boundary surface along which temperature or transition data is being specified.

SURFACE surfname

This keyword specifies the boundary surface in zone zone_number along which temperature or transition data is being specified. Currently, the applicable surface names are I1, IMAX, J1, JMAX, K1, and KMAX, corresponding to the i₁, i_max, j₁, j_max, k₁, and k_max surfaces, respectively.

SUBSET ALL

In the future, this keyword will allow temperature/transition information to be specified over a subset of the surface. Currently, SUBSET ALL is only used to update the counter of the number of temperature/transition surfaces, and must be specified once for each surface.

Example

As an example, suppose we are specifying the wall temperature distribution along the j₁ surface in zone 1, and the j₁ and j_max surfaces in zone 2. In addition, suppose we're specifying boundary layer transition along the j₁ surface in zone 1. If existing temperature/transition files are being used, created with the older tmptrn utility, the TTSPEC keyword block for the initial run might be

   TTSPEC
      TYPE TEMPERATURE
         ZONE 1
            MODE FILE temp.z1j1.asc
            SURFACE J1
            SUBSET ALL
         ZONE 2
            MODE FILE temp.z2j1.asc
            SURFACE J1
            SUBSET ALL
            MODE FILE temp.z2jm.asc
            SURFACE JMAX
            SUBSET ALL
      TYPE TRANSITION
         ZONE 1
            MODE FILE tran.z1j1.asc
            SURFACE J1
            SUBSET ALL
   ENDTTSPEC

Since the temperature/transition data will be written into the .cfl file during the initial run, later (i.e., restart) runs could use

   TTSPEC
      TYPE TEMPERATURE
         ZONE 1
            MODE CURRENT
            SURFACE J1
            SUBSET ALL
         ZONE 2
            MODE CURRENT
            SURFACE J1
            SUBSET ALL
            MODE CURRENT
            SURFACE JMAX
            SUBSET ALL
      TYPE TRANSITION
         ZONE 1
            MODE CURRENT
            SURFACE J1
            SUBSET ALL
   ENDTTSPEC