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Hi,
Is this different to your other thread?
Your model is under constrained, you must properly define what is happening at the inlet so that CFD can define the density.
Ideally, a Total Pressure, Mass Flow rate and Temperature, here is a link explaining how to calculate them.
Then you need to assign a Total Temperature in the Solve window also.
I think I said this before but please consider running a 2D axisymmetric analysis, no need to spend time in 3D here I don't think 🙂
Jon Wilde
Technical Support Manager
CFD Knowledge Network | CFD Help | My Screencasts | Autodesk Simuation YouTube | CFD Tutorials
Hi,
Is this different to your other thread?
Your model is under constrained, you must properly define what is happening at the inlet so that CFD can define the density.
Ideally, a Total Pressure, Mass Flow rate and Temperature, here is a link explaining how to calculate them.
Then you need to assign a Total Temperature in the Solve window also.
I think I said this before but please consider running a 2D axisymmetric analysis, no need to spend time in 3D here I don't think 🙂
Jon Wilde
Technical Support Manager
CFD Knowledge Network | CFD Help | My Screencasts | Autodesk Simuation YouTube | CFD Tutorials
Not yet, no.
You need to assign the conditions I explained above 🙂
Does that all make sense?
Jon Wilde
Technical Support Manager
CFD Knowledge Network | CFD Help | My Screencasts | Autodesk Simuation YouTube | CFD Tutorials
Not yet, no.
You need to assign the conditions I explained above 🙂
Does that all make sense?
Jon Wilde
Technical Support Manager
CFD Knowledge Network | CFD Help | My Screencasts | Autodesk Simuation YouTube | CFD Tutorials
"
Ideally, a Total Pressure, Mass Flow rate and Temperature, here is a link explaining how to calculate them.
Then you need to assign a Total Temperature in the Solve window also.
"
You mean to set it as picture here ?
Yeah i've did it .
inlet static/gage 2 atm
outlet static/gage 0 atm
No. Is it ok to change it for me.
I am trying to make set up as simple as possible and i am using CDF since 1 week.
Currently i would like to use the most basic config.
I've put temp around 26 degrees Celsius.
under compressible option in the Solve dialog window.
I set compressible flow.
"
Ideally, a Total Pressure, Mass Flow rate and Temperature, here is a link explaining how to calculate them.
Then you need to assign a Total Temperature in the Solve window also.
"
You mean to set it as picture here ?
Yeah i've did it .
inlet static/gage 2 atm
outlet static/gage 0 atm
No. Is it ok to change it for me.
I am trying to make set up as simple as possible and i am using CDF since 1 week.
Currently i would like to use the most basic config.
I've put temp around 26 degrees Celsius.
under compressible option in the Solve dialog window.
I set compressible flow.
That is my last setup
inlet 130 m/s
outlet 0 atm static gage
That is my last setup
inlet 130 m/s
outlet 0 atm static gage
There is not really a simple approach to doing this, CFD simply will not give you the right results without a properly defined inlet - it needs to know what the exact air properties here are.
Are you comfortable calculating what I shared?
If not, let's do it step by step:
- Do you know the flow rate or do you need CFD to calculate this?
- How is the device fed, where does the air come from?
Jon Wilde
Technical Support Manager
CFD Knowledge Network | CFD Help | My Screencasts | Autodesk Simuation YouTube | CFD Tutorials
There is not really a simple approach to doing this, CFD simply will not give you the right results without a properly defined inlet - it needs to know what the exact air properties here are.
Are you comfortable calculating what I shared?
If not, let's do it step by step:
- Do you know the flow rate or do you need CFD to calculate this?
- How is the device fed, where does the air come from?
Jon Wilde
Technical Support Manager
CFD Knowledge Network | CFD Help | My Screencasts | Autodesk Simuation YouTube | CFD Tutorials
inlet on the left side in this particular geometry
you can find it attached also
It also is very simple
no complex shapes/curves
cones and cylinders
inlet on the left side in this particular geometry
you can find it attached also
It also is very simple
no complex shapes/curves
cones and cylinders
Hi,
Might I ask you to stick to one thread? We have three now for the same model.
You need to define this better, it simply will not work with what you have assigned.
At the inlet, you must calculate the Total Pressure and the Temperature.
You also need to define a Total Temperature in the Solve window.
Please answer some of the questions I posted above or I will be unable to help further.
Thanks,
Jon
Jon Wilde
Technical Support Manager
CFD Knowledge Network | CFD Help | My Screencasts | Autodesk Simuation YouTube | CFD Tutorials
Hi,
Might I ask you to stick to one thread? We have three now for the same model.
You need to define this better, it simply will not work with what you have assigned.
At the inlet, you must calculate the Total Pressure and the Temperature.
You also need to define a Total Temperature in the Solve window.
Please answer some of the questions I posted above or I will be unable to help further.
Thanks,
Jon
Jon Wilde
Technical Support Manager
CFD Knowledge Network | CFD Help | My Screencasts | Autodesk Simuation YouTube | CFD Tutorials
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