problem Hcoeff display
 

I have perfored an aanlysis and I'm trying to disply the hcoeff, but I can't the following message appear: wall variable hflu is not on the data file...what that means???

Re: problem Hcoeff display
 

Hello raffap,

What is hcoeff? A coefficient which concerns a wall parameter?

George

Re: problem Hcoeff display
 

hcoeff is the heat transfer coefficent, I have to display this coefficent on a wall boundary. the command is getw-->hcoeff,tbulk

Re: problem Hcoeff display
 

did you post it in .pst? You have to choose post in the output tab

Re: problem Hcoeff display
 

Select it at the output tab and do a restart run with zero iterations and hcoe should be in the *.pst file.

If you are using version 4 without solving the temperature equation you mith have to cheat a bit and tweak the *.prob file using the following script:


#!/usr/bin/perl

print "modifying *.prob-File for writing htran\n";

if (!defined $ARGV[0]) {
print "USAGE : htran.pl casename\n";
exit;
}

$case = $ARGV[0];
$file = "${case}.prob";

$line = "POSTWL SHEA YPLU DIST HTRA";

open(IFILE , "<$file") || die "Datei $file ist nicht vorhanden";
@alles = <IFILE>;
$text = join("",@alles);
close(INFILE);

$text =~ s/POSTWL.*/$line/;

open(OUTFILE , ">$file") || die "Datei ... ist nicht vorhanden";
print OUTFILE "$text";
close(OUTFILE);

Re: problem Hcoeff display
 

The forum software has some problems with perl code.

the line with @alles should be

@alles = <_IFILE_> ;

without the "_" characters

yplus value in heat transfer
 

hi expert my problem is finding the heat transfer coefficient around the cylinder in a uniform flow. but i got the ypus value nearly .5 to 3. according to my theoretical knowledge for this yplus value k-e model overpredict the heat transfer. how to get the accurate heat transfer coefficient. but i cant provide the fine mesh in near walls because i want to find the boundary layer effects how to use wall functions for this kind of problem

by kathir

Re: yplus value in heat transfer
 

Hi raffap, Check whether your postprocessing Result file or restart file. I have this problem some time before, I had spent nearly a day to plot HTC from, without noticing that I am loading restart file.