Wind-US Utilities

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trans

The trans utility is now obsolete and no longer being maintained. The tmptrn utility is recommended for creating boundary layer temperature and transition files.

trans may be used to create wall temperature and boundary layer transition files for use with Wind-US's TEMPERATURE and TRANSITION keywords. This utility creates files to be read by Wind Version 1.0. For Wind 2.0 and later, use the tmptrn utility.

The user must first create a file containing information about the grid being used, using the LIST NUMBER command in GMAN. This file is then read as input by trans, and the user is prompted for the additional information needed.

Within each zone, boundary layer transition and/or wall temperature may be specified on j and k boundaries as a function of the i index. Boundary layer transition is indicated by a number from 0.0 to 1.0, indicating laminar and fully turbulent flow, respectively. Wall temperature is specified in degrees Rankine, with 0.0 indicating an adiabatic wall. The defaults, for zones not specified, are fully turbulent and adiabatic wall.

Four functional distributions are allowed.

Constant.
Constant for i < i₁ and i > i₂, and variable in between. The variation between i₁ and i₂ is determined by a user-specified polynomial exponent.
Constant within i₁ to i₂ ranges. With this option, an arbitrary distribution may be input to Wind-US by specifying the value at each i grid point.
Piecewise linear between specified i locations.

As an example, suppose we have the three-zone configuration shown below, and we want to run a viscous case with a boundary layer transition region from laminar to turbulent flow between x = 1.5 and 2.5. This corresponds to i = 7 to 11 on the j₁ surface in zone 1, and i = 13 to 21 on the j_max surface in zone 2.

Three-zone grid; zones 1 & 2 are bottom and top of upstream half of duct, zone 3 is downstream half

Input grid for trans

We could create the appropriate boundary layer transition file, for use with Wind-US's TRANSITION keyword, as shown below. Lines in slanted type are typed by the user.

   % trans
   
     TRANSITION FILE GENERATION PROGRAM
     NOTE: (I=1,I=IMAX DISABLED FOR NOW)
   
     Input is a GMAN # of points list in FORTRAN unit 9
         (GMAN command: LIST NUM FILE xxx.num)
     Enter dimensions file name:
   case4.ngm
   
     Output is in FORTRAN unit 8 (ftn08 for unix systems)
   
     ARE YOU GENERATING 0 - TRANSITION OR
                        1 - TEMPERATURE FILE?
     Enter 0 or 1
   0
     0.0 = Laminar
     1.0 = Fully Turbulent
   
     ZONE            1 IMAX,JMAX,KMAX =           17           6           1
     ZONE            2 IMAX,JMAX,KMAX =           33          11           1
     ZONE            3 IMAX,JMAX,KMAX =           17          11           1
    All zone boundaries are assumed to be turbulent 
             or adiabatic unless changed
    Input first zone to be changed (0=no more changes)
   1
     Distribution type menu
     0 - constant
     1 - Constant i<i1, transition, constant i>i2
     2 - Constant within i1,i2 ranges
     3 - Piecewise linear between i locations
   
     Enter distribution type for
        Zone            1 Boundary            3
   1
   
     Entering i outside i=1,imax allows starting
       or ending zone within the transition region
     For instantaneous: start = last i at upstream
                        end   = next i location
     INPUT I STATION TO START TRANSITION
   7
     INPUT I STATION TO END TRANSITION
   11
     Polynomial transition parameter
     0  - not allowed
     <1 - concave down
     1. - linear transition
     >1 - concave up
     INPUT POWER OF POLYNOMIAL
   1
     Distribution type menu
     0 - constant
     1 - Constant i<i1, transition, constant i>i2
     2 - Constant within i1,i2 ranges
     3 - Piecewise linear between i locations
   
     Enter distribution type for
        Zone            1 Boundary            4
   0
     Enter value for this boundary
   0
    Input next zone to be changed (0=no more changes)
   2
     Distribution type menu
     0 - constant
     1 - Constant i<i1, transition, constant i>i2
     2 - Constant within i1,i2 ranges
     3 - Piecewise linear between i locations
   
     Enter distribution type for
        Zone            2 Boundary            3
   0
     Enter value for this boundary
   0
     Distribution type menu
     0 - constant
     1 - Constant i<i1, transition, constant i>i2
     2 - Constant within i1,i2 ranges
     3 - Piecewise linear between i locations
   
     Enter distribution type for
        Zone            2 Boundary            4
   1
   
     Entering i outside i=1,imax allows starting
       or ending zone within the transition region
     For instantaneous: start = last i at upstream
                        end   = next i location
     INPUT I STATION TO START TRANSITION
   13
     INPUT I STATION TO END TRANSITION
   21
     Polynomial transition parameter
     0  - not allowed
     <1 - concave down
     1. - linear transition
     >1 - concave up
     INPUT POWER OF POLYNOMIAL
   1
    Input next zone to be changed (0=no more changes)
   0
    Writing zone            3

Last updated 26 Aug 2015