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.
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 jmax surface in zone 2.
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