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<div class="moz-cite-prefix">Hi Ravi<br>
<br>
The first error means you have no restart files, which is obvious
for the first run. Restart files are (ARP### and ARV###) are
generated at the end of the run if the tolerance is not reached.
You control it by parameter 69 in ###.rea. Simply set it to 0 for
the first run. In addition parameters 71 and 72 set the checkpoint
number for reading and writing (to avoid overwriting). Number of
files depends on the other parameters and preprocessing flags
used.<br>
Regards<br>
Adam<br>
<br>
On 2016-03-27 04:45, <a class="moz-txt-link-abbreviated" href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.gov</a> wrote:<br>
</div>
<blockquote
cite="mid:mailman.18331.1459046724.24727.nek5000-users@lists.mcs.anl.gov"
type="cite">
<div dir="ltr">
<div>
<div>
<div>
<div>Hi Adam, <br>
<br>
</div>
I am guessing I am using your code for stability tools in
NEK. I have downloaded the code from <a
moz-do-not-send="true"
href="https://nek5000.mcs.anl.gov/toolboxes/"
target="_blank"><a class="moz-txt-link-freetext" href="https://nek5000.mcs.anl.gov/toolboxes/">https://nek5000.mcs.anl.gov/toolboxes/</a></a>.<br>
<br>
</div>
I am trying to reproduce the ext_cyl example, as is, to get
some familiarity. <br>
<br>
</div>
I have been able to compile the code (after some modifications
to compile on the platform I intent to run my analysis). I
have the base flow file "ext_cyl0.f00005" in the simulation
folder. When I run the ext_cyl, I get the following error:<br>
<br>
<br>
******************************************************************************************************************<br>
call userchk<br>
ARNOLDI:<br>
Reading checkpoint<br>
0 0 OPEN: ARPext_cyl0.f00005<br>
ARPext_cyl0.f00005<br>
byte_read() :: fopen failure2!<br>
ERROR: mfi_arnp, wrong header; abort.<br>
<br>
call exitt: dying ...<br>
******************************************************************************************************************<br>
</div>
<br>
<div><br>
<div>I have also pasted below the parameters printed in the
log file for your reference. <br>
</div>
<div><br>
******************************************************************************************************************<br>
</div>
122 Parameters from
<a class="moz-txt-link-freetext" href="file:/global/u2/r/rtumkur/eig_Setup/ARNOLDI/ext_cyl.rea">file:/global/u2/r/rtumkur/eig_Setup/ARNOLDI/ext_cyl.rea</a><br>
1 1.00000 p001 DENSITY<br>
2 -50.0000 p002 VISCOS<br>
7 1.00000 p007 RHOCP<br>
8 1.00000 p008 CONDUCT<br>
11 50003.0 p011 NSTEPS<br>
12 -5.000000E-03 p012 DT<br>
15 2500.00 p015 IOSTEP<br>
17 1.00000 p017<br>
18 0.500000E-01 p018 GRID < 0 --> # cells on
screen<br>
19 -1.00000 p019 INTYPE<br>
20 7.00000 p020 NORDER<br>
21 0.100000E-09 p021 DIVERGENCE<br>
22 0.100000E-09 p022 HELMHOLTZ<br>
24 0.100000E-09 p024 TOLREL<br>
25 0.100000E-04 p025 TOLABS<br>
26 1.00000 p026 COURANT/NTAU<br>
27 3.00000 p027 TORDER<br>
28 0.00000 p028 TORDER: mesh velocity (0: p28=p27)<br>
31 -1.00000 p031 NPERT: #perturbation modes<br>
59 0.00000 p059 !=0 --> full Jac. eval. for each
el.<br>
65 1.00000 p065 #iofiles (eg, 0 or 64); <0
--> sep. dirs<br>
66 4.00000 p066 output : <0=ascii, else binary<br>
67 4.00000 p067 restart: <0=ascii, else binary<br>
69 1.00000 p069 : PROPER RESTART: 0 - do not use
my_full_restart; 1- use it<br>
71 5.00000 p071 : ARNOLDI: checkpoint file number
for restart (reading)<br>
72 6.00000 p072 : ARNOLDI: checkpoint file number
for saving data<br>
99 3.00000 p099 dealiasing: <0--> off/3-->
old/4--> new<br>
102 1.00000 p102 Dump out divergence at each time
step<br>
108 1.00000 p108 : ARNOLDI: 0 if no arnoldi<br>
109 40.0000 p109 : ARNOLDI: frequency of calling
arn_solve<br>
110 4.00000 p110 : ARNOLDI: maximal number of
arnoldi cycles<br>
111 90.0000 p111 : ARNOLDI: size of Krylov space<br>
112 30.0000 p112 : ARNOLDI: number of eigenvectors<br>
113 1.00000E-06 p113 : ARNOLDI: arpack tolerance<br>
119 1.00000 p119 : SPONGE STRENGTH<br>
120 25.0000 p120 : SPONGE TOTAL WIDTH<br>
121 3.00000 p121 : SPONGE DROP WIDTH (INFLOW)<br>
122 5.00000 p122 : SPONGE RISE WIDTH (OUTFLOW)<br>
******************************************************************************************************************<br>
<br>
</div>
<div>I'd appreciate if you can let me what am I missing in the
set up which might be leading to this issue? Please let me
know if you need any other information to understand this
issue.<br>
<br>
<br>
</div>
<div>Regards, <br>
</div>
<div>Ravi<br>
<br>
</div>
<div>
<div>
<div><br>
</div>
</div>
</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Tue, Mar 15, 2016 at 4:06 AM, <span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:nek5000-users@lists.mcs.anl.gov"
target="_blank">nek5000-users@lists.mcs.anl.gov</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Hi<br>
<br>
To force base flow to be constant you have to set negative
param(31) in your ###.rea file. Something like<br>
-1.00000 p031 NPERT: #perturbation modes<br>
Of course you need the base flow as well. It could be
analytical one set in useric, or just a field read during
initialisation.<br>
Regards<br>
Adam
<div class="HOEnZb">
<div class="h5"><br>
<br>
<br>
On 2016-03-15 08:49, <a moz-do-not-send="true"
href="mailto:nek5000-users@lists.mcs.anl.gov"
target="_blank">nek5000-users@lists.mcs.anl.gov</a>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi Neks,<br>
<br>
I'm trying to use the linear stability tool of
Nek5000.<br>
<br>
To start with, I am trying to run the ext_cyl example.
However, I have found the following problem:<br>
<br>
ERROR: arnoldi assumes constant base flow.<br>
<br>
I have found on the README tutorial that the base flow
has to be specified on the .rea file. I have included
a file in the PRESOLVE/RESTART option, however I still
have the same error.<br>
<br>
What should I modify?<br>
<br>
Finally, I have also used a subroutine defined in the
.usr file that reads the file containing the base
flow. However, the error persist...<br>
<br>
Could you help me, please?<br>
<br>
Cheers<br>
SL<br>
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<br>
<br clear="all">
<br>
-- <br>
<div class="gmail_signature">
<div dir="ltr"><span style="font-family:arial
narrow,sans-serif"><font size="4">Ravi Kumar R. Tumkur</font>,<b>
</b><font size="4">PhD.</font><br>
Phone: <a moz-do-not-send="true" value="+12177787538">217
778 7538</a></span></div>
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