Computational Fluid Dynamics (CFD) workbench using OpenFOAM
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- Crossleyuk
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Re: Computational Fluid Dynamics (CFD) workbench using OpenFOAM
Yes, I did try the velocity input immediately after receiving that forum response, with no success.
However, making the change to the model case I've privided to you recently has resulted in success. Fantastic news!!
But does thie suggest that I can't repeat all the historic static pressure inputs that I successfully condicted with FC 0.17 and the old CfdOF? I'm trying to CFD existing physical testing that I conducted many years ago.
Many thanks and appologies if I've been difficult.
Michael
However, making the change to the model case I've privided to you recently has resulted in success. Fantastic news!!
But does thie suggest that I can't repeat all the historic static pressure inputs that I successfully condicted with FC 0.17 and the old CfdOF? I'm trying to CFD existing physical testing that I conducted many years ago.
Many thanks and appologies if I've been difficult.
Michael
- oliveroxtoby
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Re: Computational Fluid Dynamics (CFD) workbench using OpenFOAM
Ah. I didn't realise that this setup was working previously. If you still have or can re-generate the OpenFOAM case that was created (the "case" directory that is written), that would probably tell us why.Crossleyuk wrote: ↑Fri Sep 13, 2019 1:03 pm But does thie suggest that I can't repeat all the historic static pressure inputs that I successfully condicted with FC 0.17 and the old CfdOF? I'm trying to CFD existing physical testing that I conducted many years ago.
- Crossleyuk
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Re: Computational Fluid Dynamics (CFD) workbench using OpenFOAM
Thanks Oliver, happy to do what ever I can.
I'm just now starting to migrate the 0.17 model case, that I've had great results from, into 0.18 and new CfdOF (both of which I love). It'll take me a day or two but my intention is to start from scratch and move forward. I have geat plans for this CFD assessment of my historic physicl testing data. With an aim of moving my research into a new era.
I'm loving the whole learning and relurning process and can't wait to try my revamped model. But will have to use static pressures for the two inputs and single output. My aim is to ontain CFD representations of the physical testing flow and non-dimensional pressure flow characteristics of the device.
Fingers crossed and I'll be back to you ASAP with as much information as I can.
Many thanks man!
Michael
I'm just now starting to migrate the 0.17 model case, that I've had great results from, into 0.18 and new CfdOF (both of which I love). It'll take me a day or two but my intention is to start from scratch and move forward. I have geat plans for this CFD assessment of my historic physicl testing data. With an aim of moving my research into a new era.
I'm loving the whole learning and relurning process and can't wait to try my revamped model. But will have to use static pressures for the two inputs and single output. My aim is to ontain CFD representations of the physical testing flow and non-dimensional pressure flow characteristics of the device.
Fingers crossed and I'll be back to you ASAP with as much information as I can.
Many thanks man!
Michael
- Crossleyuk
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Re: Computational Fluid Dynamics (CFD) workbench using OpenFOAM
Okay Oliver,
Rebuild complete with some changes to make it easy for me to check out the pressure/velocity imput implications.
The required model has four axial control inputs and four radial inputs. But I've now limited the radial inputs to one. The inputs are 1.0 m/s in the appropriate direction. There is still a single axial pressure output. I tried to included the model and free folder files. Going to look ito changing the output folder when I understand what is happening.
Strange, I could not attatch the model file to this post. I assume that it's too big but no idea why. I'll take another look and get back to you.
Hope this is if some assistance and I'm still working on it and will get the model file to you. Would a pdf of the Report view text help?
Michael
Rebuild complete with some changes to make it easy for me to check out the pressure/velocity imput implications.
The required model has four axial control inputs and four radial inputs. But I've now limited the radial inputs to one. The inputs are 1.0 m/s in the appropriate direction. There is still a single axial pressure output. I tried to included the model and free folder files. Going to look ito changing the output folder when I understand what is happening.
Strange, I could not attatch the model file to this post. I assume that it's too big but no idea why. I'll take another look and get back to you.
Hope this is if some assistance and I'm still working on it and will get the model file to you. Would a pdf of the Report view text help?
Michael
- Crossleyuk
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Re: Computational Fluid Dynamics (CFD) workbench using OpenFOAM
After taking a closer look at the new dialogues for the fluid boundaries I noted that I could define a normal to wall and provide velocities at each of the four radial inlets in the attached model.
As a result, it now contains four radial and four axial inlets each with a 1m/s inlet velocity and it is working fine but is very slow. 500 iterations overnight.
Great progress though but I really must be able to define my actual testing approach, i.e. setting the following:
1) Atmospheric pressure at the four small axial inlets identified as "Axial_Control_Inlets"
2) Atmospheric pressure at the four larger radial inlets identified as "Radial_Inlet_#1 to #4"
3) A negative (fan) depression of -1500Pa gauge at the outlet identified as "Axial_Outlet"
Going to let it run to the 2000 steps to ensure all is good but will be making further changes,
Many thanks again.
OS: Windows 10
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.16117 (Git)
Build type: Release
Branch: releases/FreeCAD-0-18
Hash: dbb4cc6415bac848a294f03b80f65e888d531742
Python version: 3.6.6
Qt version: 5.6.2
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/UnitedStates (en_US)
As a result, it now contains four radial and four axial inlets each with a 1m/s inlet velocity and it is working fine but is very slow. 500 iterations overnight.
Great progress though but I really must be able to define my actual testing approach, i.e. setting the following:
1) Atmospheric pressure at the four small axial inlets identified as "Axial_Control_Inlets"
2) Atmospheric pressure at the four larger radial inlets identified as "Radial_Inlet_#1 to #4"
3) A negative (fan) depression of -1500Pa gauge at the outlet identified as "Axial_Outlet"
Going to let it run to the 2000 steps to ensure all is good but will be making further changes,
Many thanks again.
OS: Windows 10
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.16117 (Git)
Build type: Release
Branch: releases/FreeCAD-0-18
Hash: dbb4cc6415bac848a294f03b80f65e888d531742
Python version: 3.6.6
Qt version: 5.6.2
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/UnitedStates (en_US)
Last edited by Crossleyuk on Wed Sep 18, 2019 9:31 am, edited 1 time in total.
- Crossleyuk
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Re: Computational Fluid Dynamics (CFD) workbench using OpenFOAM
Here is the actual model for the above note. No mesh due to resulting large file size.
Michael
Michael
- Attachments
-
- FC0.18_12in_VXA_Axial_Diffuser - Rev P2.FCStd
- (89.31 KiB) Downloaded 67 times
- Crossleyuk
- Posts: 165
- Joined: Wed Jun 20, 2018 7:47 am
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Re: Computational Fluid Dynamics (CFD) workbench using OpenFOAM
This was the final iteration screen after it failed with a memory error, probably my fault playing arround while it was running. Basically it worked great with velocity boudaries but will not run at all with the pressures boundaries I require.
I've also provided the text at the end of report view and some files from temp folder but not sure if they are valid to that case.
Michael
I've also provided the text at the end of report view and some files from temp folder but not sure if they are valid to that case.
Michael
- Attachments
-
- FC0.18 12in VSA Diffuser Only - Normal Velocity 1000 Iterations Memory Error.PNG (111.65 KiB) Viewed 2848 times
- Crossleyuk
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- Joined: Wed Jun 20, 2018 7:47 am
- Location: United Kingdom
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Re: Computational Fluid Dynamics (CFD) workbench using OpenFOAM
Certainly working with velocity boundaries.
Certainly working with velocity boundaries.
Michael
Certainly working with velocity boundaries.
Michael
- Crossleyuk
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Re: Computational Fluid Dynamics (CFD) workbench using OpenFOAM
Hi Oliver,
OS: Windows 10
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.16117 (Git)
Build type: Release
Branch: releases/FreeCAD-0-18
Hash: dbb4cc6415bac848a294f03b80f65e888d531742
Python version: 3.6.6
Qt version: 5.6.2
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/UnitedStates (en_US)
You were mentioned in dispatches because now I have a working FC 0.18 model I'm now having problems with Paraview and posted the following on Help on Using FreeCAD forum.
Response was:
So sorry, back to you again now.
First off, FreeCAD 0.19 is clearly not available but I see that 0.18.3 is. Basically, I can get Paraview 5.4.1 to work, hence the above image but I can't save or load states. I'm relluctant to make more changes but should I try 0.18.3?
Many thanks and apologies again.
Michael
OS: Windows 10
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.16117 (Git)
Build type: Release
Branch: releases/FreeCAD-0-18
Hash: dbb4cc6415bac848a294f03b80f65e888d531742
Python version: 3.6.6
Qt version: 5.6.2
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/UnitedStates (en_US)
You were mentioned in dispatches because now I have a working FC 0.18 model I'm now having problems with Paraview and posted the following on Help on Using FreeCAD forum.
I have been using FreeCAD 0.17 and CfdOF for a year with great results. Recently moved to FreeCAD 0.8 and now having problems with Paraview 5.4.1. It will load from FreeCAD and from my Praview icon but I cannot do anything. It crashes and hangs up of I try to load a state or select open. It just sits there with no response and I have to end the task to shut it down. So I downloaded PV 5.4.1 but no change and then downloded PV 5.7.0 and it works fine. But I can't run it from CfdSolver or import my CfdOF case into this later Paraview version. So I'm confused, is there a way to get CfdSolver to start PV 5.7.0?
Response was:
You should probably ask in the FEM/CFD subforum. I know that the CfdOF project is under heavy development, so Oliver, the developer, generally recommends to try with the latest version of CfdOF, Paraview, and OpenFOAM, so that everything works okay. Also trying with the latest version of FreeCAD, 0.19.
So sorry, back to you again now.
First off, FreeCAD 0.19 is clearly not available but I see that 0.18.3 is. Basically, I can get Paraview 5.4.1 to work, hence the above image but I can't save or load states. I'm relluctant to make more changes but should I try 0.18.3?
Many thanks and apologies again.
Michael