Hello everyone!
There is a discussion in the german forum about designing
the air intake of a four-stroke Audi racing engine.
https://forum.freecadweb.org/viewtopic. ... 6&start=90
https://forum.freecadweb.org/viewtopic. ... 5&start=70
At the moment we use simplefoam-solver with steady/single-phase/incompressible option.
Does it makes sense to use the new Hisa-solver for such a problem?
Would be nice to see a pressure-wave / temperature-distribution running
through the engine.
At full-throttle the engine runs at 7500 rpm.
Stroke 92,8 mm, drilling 84 mm.
This gives an average mass-flow (inlet condition) of 31 grams air/sec.
The average air speed is approx 20 m/s, max piston speed is 73 m/s,
That are obviously not high-mach numbers.
When having a look at fvSchemes, there is the word „rPseudoDeltaT“.
Is Hisa a „pseudo-transient“-method? If so, how must I interpret the iteration-steps?
@Oliver: a tutorial about hisa would be sooo nice.
Comments/ideas welcome.
Thomas
Engine-design: air intake
Moderator: oliveroxtoby
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Re: Engine-design: air intake
As a density-based solver, HiSA is best used at Mach numbers > 0.3. A pressure-based compressible solver such as rhoSimpleFoam/rhoPimpleFoam would probably be best here.thschrader wrote: ↑Wed Oct 03, 2018 10:21 am The average air speed is approx 20 m/s, max piston speed is 73 m/s,
That are obviously not high-mach numbers.
Dual timestepping with local timestepping is used to converge the steady state solution. The pseudo-timestep used for this has no relation to actual time and is automatically computed to converge as quickly as possible.When having a look at fvSchemes, there is the word „rPseudoDeltaT“.
Is Hisa a „pseudo-transient“-method? If so, how must I interpret the iteration-steps?
@Oliver: a tutorial about hisa would be sooo nice.
There are some example cases in the source - see hisa.gitlab.io
Please provide all the information requested in this post before reporting problems with CfdOF.
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Re: Engine-design: air intake
Hello Oliver,oliveroxtoby wrote: ↑Thu Oct 04, 2018 9:33 pm There are some example cases in the source - see hisa.gitlab.io
sorry, I have overlooked the Hisa-tutorials on gitlab.
I am trying to rebuild the basic-finner tutorial with FC.
http://hisa.gitlab.io/archive/asc/basic ... inner.html
How can I generate the nice mesh (or a mesh closed to this)
you used in the tutorial? I have set a basic element-size of 300 mm
(the cube in the corner) and 3 refinement boxes (refinement level 0,5 each box)
and at least a surface refinement of 0,2 with 5 boundary layers. As a start.
Meshing works, but the boundary-layers are located wrong.
According to the uav-tutorial: must I first set the surface refinement of
the body and after that the volume refinement? Is there a special order needed
of the mesh-refinement objects in the model tree?
I used a finner with a diameter of 200 mm and the dimensions
from the tutorial.
I downloaded the shockTube tutorial from gitlab and did a run with
bluecfd. No problems.
Air intake Audi-engine and my wrong thoughts about using Hisa:
At 7500 rpm the piston needs 0,004 seconds from the upper dead-point
to the lower dead- point („loading“-phase). Can the air follow this movement?
At atmospheric pressure of 100 kPa and a „vacuum“ in the cylinder
the air would fill the vacuum with approx 400 m/s. But the max piston speed is
at 70 m/s, the air cant be faster. This gives a Mach-number of 0,2,
I think for a non-scientific approach the use of simpleFoam solver is ok.
Thomas
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Re: Engine-design: air intake
The mesh shown was generated with different meshing tool to cfMesh (Hexpress Hybrid I think). However your mesh looks OK to me. Have you tried selecting the symmetry plane and un-setting boundary layers on that patch?thschrader wrote: ↑Fri Oct 05, 2018 5:12 pm
I am trying to rebuild the basic-finner tutorial with FC.
http://hisa.gitlab.io/archive/asc/basic ... inner.html
How can I generate the nice mesh (or a mesh closed to this)
you used in the tutorial? I have set a basic element-size of 300 mm
(the cube in the corner) and 3 refinement boxes (refinement level 0,5 each box)
and at least a surface refinement of 0,2 with 5 boundary layers. As a start.
Meshing works, but the boundary-layers are located wrong.
No special order needed.According to the uav-tutorial: must I first set the surface refinement of
the body and after that the volume refinement? Is there a special order needed
of the mesh-refinement objects in the model tree?
I used a finner with a diameter of 200 mm and the dimensions
from the tutorial.
Please provide all the information requested in this post before reporting problems with CfdOF.
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Re: Engine-design: air intake
No, how can I do this in the GUI?oliveroxtoby wrote: ↑Tue Oct 09, 2018 6:35 am Have you tried selecting the symmetry plane and un-setting boundary layers on that patch?
I have the same problem when using a cylinder. The boundary layer elements
are located correct, when the cylinder is as long (or longer) than the cube.
When the cylinder is inside the cube, the boundary elements are located wrong.
I experimented hours but cant find the reason.
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Re: Engine-design: air intake
I was thinking you could add the symmetry face as a refinement region and unselect boundary layers (or set them to 1), but I don't think that will make a difference.thschrader wrote: ↑Thu Oct 11, 2018 2:15 pmNo, how can I do this in the GUI?oliveroxtoby wrote: ↑Tue Oct 09, 2018 6:35 am Have you tried selecting the symmetry plane and un-setting boundary layers on that patch?
Try removing and re-adding the references in the mesh region object - if the geometry changes, the numbering will change. The cylinder works OK for me. However, cfMesh will often continue boundary layers onto adjacent patches (probably depending on feature angle), so this behaviour might be unavoidable depending on geometry.I have the same problem when using a cylinder. The boundary layer elements
are located correct, when the cylinder is as long (or longer) than the cube.
When the cylinder is inside the cube, the boundary elements are located wrong.
I experimented hours but cant find the reason.
Please provide all the information requested in this post before reporting problems with CfdOF.
Re: Engine-design: air intake
Hello,
I want to ask a question about pseudo-transient approach.
I'm trying to solve a nozzle analysis at supersonic conditions in a steady state approach but I don't know if I can turn pseudo-transient option off.
I couldn't turn it off in Freecad.
Best regards.
I want to ask a question about pseudo-transient approach.
I'm trying to solve a nozzle analysis at supersonic conditions in a steady state approach but I don't know if I can turn pseudo-transient option off.
I couldn't turn it off in Freecad.
Best regards.