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Hi All,<br>
<br>
I hate to ask such lengthy and simple questions, but I'm getting
stuck and could use a sharp kick... I read through source code,
examples, and the docs, but could still use some help... I have
some background with SEM study and my own trivial code, so I have
some understanding of the spatial discretization part of it. I have
a trivial "template" problem setup and running.<br>
<br>
My problem is understanding what some of the variables are (in
context of their use in the code), and how to use them in the .usr
file to do what I want. I'm trying to simulate a horizontal wind
turbine wake flow, using the actuator disc method and then the
actuator line method. I can get some flow results by specifying
constant body forces in .usr. I have also tried a simple use of
what I think is the z-velocity in an equation to calculate a body
force, and this seems to work also...<br>
<br>
I'd like to move on to more complex body force calculations, but
need to know more about what some of the variables are; how they're
calculated, and how they are used/called in .usr. The following is
my first pass at a list of questions:<br>
<br>
1) Spatially, which variables specify the actual GLL point numbers
(not physical coordinates, but point count in each coordinate
direction)? Are these ix,iy,iz? I assume they are numbered per
element?<br>
<br>
2) Are x,y,z the real physical coordinates in space? Are they the
actual domain size? Are there non-dimensional coordinates also?
What are the xc,yc,zc variables?<br>
<br>
3) Are ux, uy, uz the fluid velocities in the coordinate directions?<br>
<br>
4) Can the velocities and forces be specified or referred to at any
physical location, or only at the GLL points? In other words, is
there internal extrapolation going on, or do I need to specify and
read my forces at GLL points only? All the subroutines seem to call
based on ix,iy,iz; when I run the following, it does calculate some
forces:<br>
<br>
<tt>subroutine userf (ix,iy,iz,ieg)</tt><tt><br>
</tt><tt> include 'SIZE'</tt><tt><br>
</tt><tt> include 'TOTAL'</tt><tt><br>
</tt><tt> include 'NEKUSE'</tt><tt><br>
</tt><tt>c</tt><tt><br>
</tt><tt> ffx = 0.</tt><tt><br>
</tt><tt> ffy = 0.</tt><tt><br>
</tt><tt> ffz = 0.</tt><tt><br>
</tt><tt> </tt><tt><br>
</tt><tt> if
((z>70).AND.(z<71.).AND.(x>60.).AND.(x<90.)</tt><tt><br>
</tt><tt> +.AND.(y>60.).AND.(y<90.)) then</tt><tt><br>
</tt><tt> </tt><tt><br>
</tt><tt> ffz = -(.5*1.2*(uz**2.)*(4.*.9*(1.-.9)))</tt><tt><br>
</tt><tt>c ffz = (-1000.)</tt><tt><br>
</tt><tt> endif</tt><tt><br>
</tt><tt><br>
</tt><tt>c write (6,*) ffz,ieg</tt><tt><br>
</tt><tt><br>
</tt><tt> return</tt><tt><br>
</tt><tt> end</tt><br>
<br>
However, if I change my spatial selection to:<br>
<br>
<tt>if ((z==71.).AND.(x>60.).AND.(x<90.)</tt><tt><br>
</tt><tt> +.AND.(y>60.).AND.(y<90.)) then</tt><br>
<br>
I get no force output. If everything is at the GLL locations, are
there available subroutines to extrapolate to/from physical
locations? <br>
<br>
5) I assume that the subroutines in .usr are called at each time
step? Is "istep" the number of the time step? Is "time" the actual
time integration time, or the wall clock? What is "itime"? Just
want to be able to calculate physical location of a line moving on
the grid based on time step...<br>
<br>
Thanks,<br>
Murph<br>
<br>
<br>
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<v:imagedata src="signature_odea_OU_020613_files/image001.jpg" o:title=""/>
</v:shape><![endif]--><!--[if !vml]--><!--[endif]--><b
style="mso-bidi-font-weight:normal"><span
style="font-size:10.0pt;line-height: 115%">Murphy Leo
O’Dea, PE<span style="mso-spacerun:yes"> </span>“<span
class="SpellE">Murph</span>”<span
style="mso-tab-count:1"> </span><o:p></o:p></span></b></p>
<p class="MsoNormal"><span
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Mechanical Engineering<o:p></o:p></span></p>
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style="mso-bidi-font-style:normal"><span
style="font-size:10.0pt;line-height: 115%">School Of
Engineering <span class="GramE">And</span> Computer
Science<o:p></o:p></span></i></p>
<p class="MsoNormal"><i style="mso-bidi-font-style:normal"><span
style="font-size:10.0pt;line-height:115%">Oakland
University<o:p></o:p></span></i></p>
<p class="MsoNormal" style="margin-bottom:6.0pt"><span
style="font-size:10.0pt; line-height:115%"><a
href="mailto:mlodea@oakland.edu">mlodea@oakland.edu</a><o:p></o:p></span></p>
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class="moz-txt-link-freetext"
href="http://www.secs.oakland.edu/%7Emlodea/">http://www.secs.oakland.edu/~mlodea/</a><o:p></o:p></span></p>
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