A User's Manual for DELSOL3 - prod.sandia.gov - Sandia National ...
A User's Manual for DELSOL3 - prod.sandia.gov - Sandia National ...
A User's Manual for DELSOL3 - prod.sandia.gov - Sandia National ...
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Sample Problem 3b - Generating a Flux MaD <strong>for</strong> a Cavity Roof<br />
Problem Statement<br />
For the system of Problem 3a, determine the incident flux on the roof of the<br />
cavity receiver.<br />
Input Cards<br />
SAMPLE PROBLEM 3b<br />
$BASIC IPROB=O. ITAPE=3. TDESP=125.0 $<br />
$FIELD $<br />
BHSTAT $<br />
OREC B<br />
BNLFLUX IFLX=1, IFXOUT(B.I)-I. IFI.AUT=3.<br />
XFC-0.0. YFC=O.O. ZFC=16.10, POLF=180.0. AZMF=180.0.<br />
NXFLX=5. NYFLX=5. FAZMIN=-22.5. FAZMAX=+22.5.<br />
FZMIN=O.O. FZMAX=22.5 $<br />
BNLEFF B<br />
BREC W=-100. $<br />
Analysis of Input<br />
This is a per<strong>for</strong>mance rerun of a previously optimized system, as indicated by<br />
the specified values in Namelist $BASIC$. The system description is read from<br />
the file on Unit 30. The flux points are specified to be on a plane (IFLAUT=3)<br />
whose center is at the location XFC, YFC, ZFC. The values of FAZMIN, FAZ-<br />
MAX, FZMIN, and FZMAX are measured from that location. The plane is<br />
downward facing (POLF=180.0). Because the center of the flux plane is also the<br />
center of the tower, and because the cavity design (RWCAV and W) specify this<br />
design’s back wall to be at the center of the tower, FZMIN is set to zero, and FZ-<br />
MAX is set to the depth of the cavity (W/2). This means that the point (0,O) on<br />
the plane is the same point as the top point on the centerline of the cavity wall<br />
used in Sample Problem 3a.<br />
Comments on OutDut<br />
All of the output except <strong>for</strong> flux points and the flux map will be exactly the<br />
same as <strong>for</strong> the final per<strong>for</strong>mance run of Problem 3a. The smart user might have<br />
specified IPROB=2 on Namelist $BASIC$ as a means of saving computer time,<br />
since the purpose of this run wils only to generate a flux map.<br />
The flux map is generated by DELSOL assuming that the flux surface is the<br />
only surface within the aperture. Thus, <strong>for</strong> points on the flux surface which are<br />
outside the semi-circular area of the cavity, the flux levels would in real life be<br />
nonsense, since the flux would strike the wall of the cavity instead. At the flux<br />
point common with Problem 3a, the flux is calculated to be 56% of that calcu-<br />
lated in 3a. The difference is caused by the difference in the incident angle of flux<br />
on the two different flux surfaces. The cavity wall is more nearly normal to the<br />
flux, and so has a higher normal flux level than the roof, which is closer to being<br />
parallel to the incident radiation.<br />
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