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Old   February 1, 2007, 08:54
Default problem Hcoeff display
  #1
raffap
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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???
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Old   February 1, 2007, 10:23
Default Re: problem Hcoeff display
  #2
george
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Hello raffap,

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

George
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Old   February 1, 2007, 10:26
Default Re: problem Hcoeff display
  #3
raffap
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hcoeff is the heat transfer coefficent, I have to display this coefficent on a wall boundary. the command is getw-->hcoeff,tbulk
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Old   February 1, 2007, 12:04
Default Re: problem Hcoeff display
  #4
PETE
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did you post it in .pst? You have to choose post in the output tab
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Old   February 1, 2007, 17:36
Default Re: problem Hcoeff display
  #5
Balduin Bankerotti
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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);
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Old   February 1, 2007, 17:39
Default Re: problem Hcoeff display
  #6
Balduin Bankerotti
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The forum software has some problems with perl code.

the line with @alles should be

@alles = <_IFILE_> ;

without the "_" characters
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Old   February 2, 2007, 04:09
Default yplus value in heat transfer
  #7
kathir
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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
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Old   February 4, 2007, 14:57
Default Re: yplus value in heat transfer
  #8
analyse In India
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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.
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