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An object in a fluid

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TomW
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Re: An object in a fluid

Postby TomW » Wed Jun 05, 2019 8:20 pm

Your six year old must be a genius

tkaraszewski
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Re: An object in a fluid

Postby tkaraszewski » Sun Jun 09, 2019 7:10 pm

fluidity wrote:
Wed Jun 05, 2019 6:32 pm
Ok, answering my own question:
https://openfoam.org/ (the engine)
https://sim-flow.com/ (the cockpit to drive it)

Just ordered the first parts for a CNC table I'll build soon.
Steppersonline for my stepper motors, drivers, interface board and water cooled spindlemotor.
Robotdig for splined pulleys, timing belts, linear bearings.
If you get this working, please let me know how! So far all of my experiments with CFD have resulted in failures to generate meshes from models or failures for simulations to converge. It’s an enormously frustrating learning curve.

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rynhardt
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Re: An object in a fluid

Postby rynhardt » Sun Jun 09, 2019 7:23 pm

TomW wrote:
Wed Jun 05, 2019 8:20 pm
Your six year old must be a genius
Well, he likes the pictures. :lol:

fluidity
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Local Beach: Ngati Toa, Plimmerton, Titahi Bay, Waikanae, Petone, Seatoun, Lyall Bay, Eastbourne, Lake Wairarapa
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Style: Wave, jump
Gear: Late model Switch kites element and nitros,
DIY CAD ultra-concave wave twintips 1500 and 130mm with my own fin designs. Easy upwind, awesome carving. Switch Nitro 10m V7, Naish 5.3m Wing. Now focussing on Wingsurfing to rise to a new challenge. Building my own foils from my CAD design and 3D prints, built a CNC machine last year and now cutting designs with CNC as well as 3D printing.
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Re: An object in a fluid

Postby fluidity » Mon Jul 01, 2019 12:05 pm

tkaraszewski wrote:
Sun Jun 09, 2019 7:10 pm
fluidity wrote:
Wed Jun 05, 2019 6:32 pm
Ok, answering my own question:
https://openfoam.org/ (the engine)
https://sim-flow.com/ (the cockpit to drive it)

Just ordered the first parts for a CNC table I'll build soon.
Steppersonline for my stepper motors, drivers, interface board and water cooled spindlemotor.
Robotdig for splined pulleys, timing belts, linear bearings.
If you get this working, please let me know how! So far all of my experiments with CFD have resulted in failures to generate meshes from models or failures for simulations to converge. It’s an enormously frustrating learning curve.
I haven't progressed further with investigating the simulation tools yet.
Spindle motor, stepper motors and stepper motor controllers arrived and I have some 1800mm long rail and sliders on it's way. Still working out the y and z axis parts.
Planning for around 80mm z travel, 600mm y travel and 1600mm x travel.
Regarding the simulation and broken meshes, what do you do your CAD in?
I've heard that sketchup doesn't give the best meshes.
I use OPENSCAD which is a descriptive programmer's cad, it's easy to muck things up, you have to explicitly join objects, not just overlay them in 3D space. Once you understand the rules of the tools, it's easy to get good meshes. And if you mathematically describe complete surfaces, direction of facet coordinates affects which surface is inside, which is outside. Not sure about Klein bottles though!

Jfra
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Re: An object in a fluid

Postby Jfra » Mon Oct 05, 2020 6:58 pm

fluidity wrote:
Wed Jun 05, 2019 6:32 pm
Ok, answering my own question:
https://openfoam.org/ (the engine)
https://sim-flow.com/ (the cockpit to drive it)

Just ordered the first parts for a CNC table I'll build soon.
Steppersonline for my stepper motors, drivers, interface board and water cooled spindlemotor.
Robotdig for splined pulleys, timing belts, linear bearings.
A good alternative to the software packages above for this project or for any similar projects in the future is SimWorks:
https://www.idealsimulations.com/simwor ... -software/ (the CFD software)
https://www.idealsimulations.com/ (company developing it)

This is also based on OpenFoam, it free and unrestricted in its usage and comes with a good collection of tutorials, can be useful to quickly check / develop new designs.
CAD input is .igs. I am using FreeCAD which is pretty good at converting CAD formats into igs and again is free.
I hope it can be useful!
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fluidity
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Posts: 278
Joined: Sat Mar 19, 2016 11:20 pm
Kiting since: 2015
Local Beach: Ngati Toa, Plimmerton, Titahi Bay, Waikanae, Petone, Seatoun, Lyall Bay, Eastbourne, Lake Wairarapa
Favorite Beaches: Plimmerton
Style: Wave, jump
Gear: Late model Switch kites element and nitros,
DIY CAD ultra-concave wave twintips 1500 and 130mm with my own fin designs. Easy upwind, awesome carving. Switch Nitro 10m V7, Naish 5.3m Wing. Now focussing on Wingsurfing to rise to a new challenge. Building my own foils from my CAD design and 3D prints, built a CNC machine last year and now cutting designs with CNC as well as 3D printing.
Location: Porirua New Zealand
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Re: An object in a fluid

Postby fluidity » Fri Oct 09, 2020 11:12 am

tkaraszewski wrote:
Sun Jun 09, 2019 7:10 pm
fluidity wrote:
Wed Jun 05, 2019 6:32 pm
Ok, answering my own question:
https://openfoam.org/ (the engine)
https://sim-flow.com/ (the cockpit to drive it)

Just ordered the first parts for a CNC table I'll build soon.
Steppersonline for my stepper motors, drivers, interface board and water cooled spindlemotor.
Robotdig for splined pulleys, timing belts, linear bearings.
If you get this working, please let me know how! So far all of my experiments with CFD have resulted in failures to generate meshes from models or failures for simulations to converge. It’s an enormously frustrating learning curve.
I've not tried actually using it(simulation SW) yet but I use openscad for my design which uses oriented ajoining triangles to form meshes. Other CAD may use "solids" etc. I can tell you though, that FREECAD will convert back and forth between meshes and solids. I think the Autodesk group uses solids. Meshes are skins with inside and outside defined by the rotation order of the facet corner coordinates that define it. Though it might seem tricky for a klein bottle, any practical one will have thickness so what we think of as the inside is still a surface exterior of the space within the wall thickness.


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