Unable to extract TAWSS and OSI from any simulation

[Alessandro Ruggeri]

Hi,

I was trying to evaluate TAWSS and OSI from my simulations. I've already check other TAWSS/OSI threads inside the forum and through the internet, but I'm still stuck whit this problem.

I've done 7 CFD simulations involving aortics geometries successuflly, but when i try to convert results as a single file starting by the first time step (0) to the latest time step (suppose 2789) I only get velocity, pressure (and also averages of those quantities) for each time step.

TAWSS and OSI are not evaluated. The log obatained after conversion states:

WARNING: No data found for vinplane_traction at time step 0. vTAWSS, vshear_pulse and vOSI will not be calculated.
WARNING: No data found for vWSS at time step 0. vTAWSS_wss, vshear_pulse_wss and vOSI_wss will not be calculated.
WARNING: No data found for rinplane_traction at time step 0. rTAWSS, rshear_pulse and rOSI will not be calculated.
WARNING: No data found for rWSS at time step 0. rTAWSS_wss, rshear_pulse_wss and rOSI_wss will not be calculated.

I also tried to simulate the demo on your site (https://simtk.org/frs/download_confirm. ... oup_id=930), but nothing: same errors and no TAWSS and OSI in the output files.

You can see the entire log attached.

DemoProject Convert Results Log.txt

(705.47 KiB) Downloaded 14 times

Same thing switching to another computer.


Any suggestions?

Thanks!

[David Parker]

Hello,

Are you computing TAWSS and OSI results in SV?

If so then then I think you need to start the conversion from a non-zero time step.

Cheers,
Dave

[Alessandro Ruggeri]

Hi David,
thanks for the reply!

I'm computing TAWSS and OSI results in SV.

I already tried to start the conversion from a non-zero time step.
E.g., in the DemoProject with a simulation of 100 time steps and saving results at each timestep, i tried to convert resutls starting by time step 50 to 100 with 1 step increment.
SV was unable to compute TAWSS and OSI as you can see here in the log:

DemoProject Convert 50-100 Results Log.txt

(359.21 KiB) Downloaded 21 times

Also, there is a weird tingh: when i open allresults.vtu, vWSS is evaluated for time step 50, as you can see in the picture attached:

vWSS at 50.png (200.91 KiB) Viewed 442 times

So, why SV say there's no WSS at time step 50?
Can it be a solver issue?

[David Parker]

The SV log file states

Code: Select all

found vinplane_traction and adding mean, pulse, osi.
found vWSS and adding mean, pulse, osi.

WARNING: No data found for rinplane_traction at time step 50. rTAWSS, rshear_pulse and rOSI will not be calculated.
WARNING: No data found for rWSS at time step 50. rTAWSS_wss, rshear_pulse_wss and rOSI_wss will not be calculated.

which is correct, rTAWSS is only computed for CMM simulations.

The vTAWSS and vOSI quantities are in the VTP file.

It might be easier to understand the results conversion if you don't put everything in one file.

Cheers,
Dave

[Alessandro Ruggeri]

Thanks Dave!
I've found them!
I tougth TAWSS and OSI were not calculated because i can't see them inside the VTU.
So they are saved only inside the VTP... i think adding some basic info into the user guide will be usefull and avoid stuff like that.


Just two other things: what are those "error" lines inside all_results_pressure and all_results_flow intended for?

Code: Select all

step	BCT	Inlet	LCA	LCCA	LSA	RSA	outlet	
02400	115774.675584	115163.529036	115464.450265	115857.779168	115729.184324	115382.370745	116257.287164	
02401	115416.321605	114812.733300	115113.825173	115494.899931	115372.876094	115030.999218	115916.273526	
02402	115210.398680	114933.760799	115037.964219	115295.066684	115159.269591	114950.530507	115594.485102	
02403	115091.861663	115118.593766	115037.760733	115179.194422	115034.284209	114967.302630	115319.517386	
02404	114952.280107	114993.777265	114906.814838	115035.788205	114876.138164	114821.587468	115076.783149	
02405	114790.590037	114791.106222	114726.572051	114873.448499	114708.510307	114647.761771	114839.612639	
02406	114608.912566	114579.648435	114541.054730	114686.082819	114519.749231	114452.010320	114612.865884	
error_02400	3970892629704.622070	3754922957433.896484	3780397538802.400879	3995454602350.821289	3892037278276.864746	3730201623203.916992	3982939319187.969727	
error_02401	3970971570523.090820	3755002173601.449219	3780466245381.621582	3995542377828.115723	3892107934456.932129	3730269318330.630371	3982998071942.813965	
error_02402	3971054144140.145508	3755079185849.882324	3780536157082.516602	3995633861424.744629	3892182165444.385254	3730338286617.381836	3983061808171.541016	
error_02403	3971138815582.235840	3755152926781.422363	3780606014008.371094	3995727497033.785645	3892258502160.238770	3730406919451.512207	3983129953655.260742	
error_02404	3971226002701.028320	3755228763825.391113	3780678017044.362305	3995823848355.438477	3892337561544.732910	3730477928757.832520	3983202105544.401367	
error_02405	3971316160470.522949	3755308105820.402344	3780753049018.165527	3995923330259.665527	3892419561729.803223	3730551836334.448242	3983278279451.389648	
error_02406	3971409723528.506348	3755391190504.590820	3780831264290.289551	3996026499050.130859	3892504945137.187500	3730629083708.631348	3983358396113.886230	

They means that there is an error inside my simulation? An error order by 1E6???

Also, i don't understand how to start simulations by command line and specifically how to restart a stopped simulation. Is there a guide for that? I haven't found one in the web.

Thanks for all!

Cheers,
Alessandro

[Alessandro Ruggeri]

Also, inside the "simulation finish" log i found:

Code: Select all

[[55505,1],0][btl_tcp.c:559:mca_btl_tcp_recv_blocking] recv(16) failed: Connection reset by peer (104)

What does it mean?
What effect does this have on the simulation?

Thanks,
Alessandro

[David Parker]

Hi Alessandro,

The mca_btl_tcp_recv_blocking message is I believe from MPI, maybe a node has gone down on an HPC cluster.

The svSolver documentation definitely needs improvement, on my (very long) list of things to do.

Cheers,
Dave