all-results-pressure shows constant 0's
- Radhika Kulkarni
- Posts: 9
- Joined: Tue Aug 11, 2020 7:50 am
all-results-pressure shows constant 0's
Hello!
I am working on the Aortofemoral Normal - 2 tutorial, and after running the simulation, I get all 0's in my pressure file. When I upload my files in Paraview, I get pressure and velocity for the first time step only (0), but the pressure is 0. For the other timesteps, the option of pressure and velocity isn't there at all.
I have attached my simulation files below. Please do let me know if you cannot view it. Any help would be appreciated!
I am working on the Aortofemoral Normal - 2 tutorial, and after running the simulation, I get all 0's in my pressure file. When I upload my files in Paraview, I get pressure and velocity for the first time step only (0), but the pressure is 0. For the other timesteps, the option of pressure and velocity isn't there at all.
I have attached my simulation files below. Please do let me know if you cannot view it. Any help would be appreciated!
- Attachments
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- all_results-averages-from_cm-to-mmHg-L_per_min.txt
- (1.85 KiB) Downloaded 2 times
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- inflow.txt
- (20 Bytes) Downloaded 5 times
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- all_results-pressures.txt
- (536 Bytes) Downloaded 7 times
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- all_results-flows.txt
- (548 Bytes) Downloaded 3 times
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- all_results-averages.txt
- (1.85 KiB) Downloaded 1 time
- David Parker
- Posts: 1705
- Joined: Tue Aug 23, 2005 2:43 pm
Re: all-results-pressure shows constant 0's
Hi Radhika,
Looking at the all_results-pressures.txt file I only see a single step, step 0
You will need to run the simulation for a few hundred time steps to see anything interesting.
Cheers,
Dave
Looking at the all_results-pressures.txt file I only see a single step, step 0
Code: Select all
step cap_Aorta_Smoothed cap_Aorta_Smoothed_2 cap_Brachiocephalic_Right_Subclavian cap_Celiac_Hepatic cap_Common_External_Femoral cap_Left_Common_Carotid cap_Left_Internal cap_Left_Profunda cap_Left_Profunda_2 cap_Left_Renal cap_Left_Subclavian cap_Right_Common_Carotid cap_Right_Internal cap_Right_Profunda cap_Right_Profunda_2 cap_Right_Renal cap_SMA cap_Splenic
00000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000
Cheers,
Dave
- Radhika Kulkarni
- Posts: 9
- Joined: Tue Aug 11, 2020 7:50 am
Re: all-results-pressure shows constant 0's
Hi David,
I actually have the number of timesteps set to 3200 (like said in the tutorial). In my simulation converted results, I have files for each time step as well, so I'm not sure what the issue is! I have tried simply running 10 timesteps, but it gives me all 0s again.
I actually have the number of timesteps set to 3200 (like said in the tutorial). In my simulation converted results, I have files for each time step as well, so I'm not sure what the issue is! I have tried simply running 10 timesteps, but it gives me all 0s again.
- Attachments
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- timesteps.png (62.62 KiB) Viewed 434 times
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- allresults.png (217.93 KiB) Viewed 434 times
- David Parker
- Posts: 1705
- Joined: Tue Aug 23, 2005 2:43 pm
Re: all-results-pressure shows constant 0's
Hi Radhika,
I'm not sure what is going on. If you can put your SV project someplace I can download it I'll have a look.
Cheers,
Dave
I'm not sure what is going on. If you can put your SV project someplace I can download it I'll have a look.
Cheers,
Dave
- Radhika Kulkarni
- Posts: 9
- Joined: Tue Aug 11, 2020 7:50 am
- David Parker
- Posts: 1705
- Joined: Tue Aug 23, 2005 2:43 pm
Re: all-results-pressure shows constant 0's
Hi Radhika,
This is a huge mesh! How many processors did you run it on? How did you convert the results?
I was able to run the simulation fine for a new mesh with a smaller number of elements so I think the solver parameters are ok. A histor.dat file is created by the simulation, please post that file here.
Cheers,
Dave
This is a huge mesh! How many processors did you run it on? How did you convert the results?
I was able to run the simulation fine for a new mesh with a smaller number of elements so I think the solver parameters are ok. A histor.dat file is created by the simulation, please post that file here.
Cheers,
Dave
- Radhika Kulkarni
- Posts: 9
- Joined: Tue Aug 11, 2020 7:50 am
Re: all-results-pressure shows constant 0's
Hi David,
Yes, I did struggle with the meshing. It kept saying I have a facet and segment intersecting. I tried doing iterations of Local Decimation, lap. smooth, and cstr. smooth, but I do not think it worked. That is why I played around with the Max Edge Size until I got a mesh made.
I did not use MPI or processors. I simply clicked "Run Simulation". To convert my results, I did timestep of 0 to 3200 with increment 400.
May I know how you were able to create the mesh, and what you mean by "smaller number of elements"?
I also do not have a histor file in my folder!
Yes, I did struggle with the meshing. It kept saying I have a facet and segment intersecting. I tried doing iterations of Local Decimation, lap. smooth, and cstr. smooth, but I do not think it worked. That is why I played around with the Max Edge Size until I got a mesh made.
I did not use MPI or processors. I simply clicked "Run Simulation". To convert my results, I did timestep of 0 to 3200 with increment 400.
May I know how you were able to create the mesh, and what you mean by "smaller number of elements"?
I also do not have a histor file in my folder!
- David Parker
- Posts: 1705
- Joined: Tue Aug 23, 2005 2:43 pm
Re: all-results-pressure shows constant 0's
Hi Radhika,
Facet and segment intersecting are typical meshing errors, I need to look at what is causing these errors some day.
I meshed with a max edge size 0.2 without boundary layer.
Not running with MPI must have taken a week to finish? I think there is a problem with svSolver running without MPI, I can't confirm though without looking at the histor.dat file. Try rerunning the simulation with MPI using four processors.
Cheers,
Dave
Facet and segment intersecting are typical meshing errors, I need to look at what is causing these errors some day.
I meshed with a max edge size 0.2 without boundary layer.
Not running with MPI must have taken a week to finish? I think there is a problem with svSolver running without MPI, I can't confirm though without looking at the histor.dat file. Try rerunning the simulation with MPI using four processors.
Cheers,
Dave
- Radhika Kulkarni
- Posts: 9
- Joined: Tue Aug 11, 2020 7:50 am
Re: all-results-pressure shows constant 0's
Hmm.. I definitely did not wait a week! Max was 15 minutes.. I'm working on another project right now and I've been having the same problem.
I redid the mesh to 0.2 and am running the simulation now using 4 Processes, but the simulation has been stuck on 0% for a while now. I'm not sure how long this should be taking, but I thought I'd just ask. Do I wait until it's finished to Convert Results?
I've attached the histor file that was under 4_procs_case on Google Drive.
https://drive.google.com/drive/folders/ ... sp=sharing
I redid the mesh to 0.2 and am running the simulation now using 4 Processes, but the simulation has been stuck on 0% for a while now. I'm not sure how long this should be taking, but I thought I'd just ask. Do I wait until it's finished to Convert Results?
I've attached the histor file that was under 4_procs_case on Google Drive.
https://drive.google.com/drive/folders/ ... sp=sharing
- Attachments
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- simvascular_simulation.png (475.73 KiB) Viewed 320 times
Last edited by Radhika Kulkarni on Thu Oct 01, 2020 11:29 am, edited 1 time in total.
- David Parker
- Posts: 1705
- Joined: Tue Aug 23, 2005 2:43 pm
Re: all-results-pressure shows constant 0's
Hi Radhika,
Your simulations are failing for some reason. What OS are you running on and what SV and svSolver versions are you using?
Cheers,
Dave
Your simulations are failing for some reason. What OS are you running on and what SV and svSolver versions are you using?
Cheers,
Dave