Search found 95 matches

by Raedchen_im_System
Wed Feb 07, 2024 10:30 pm
Forum: CfdOF / CFD
Topic: A new series of 10 tutorials about Freecad CfdOf
Replies: 39
Views: 61980

Re: A new series of 10 tutorials about Freecad CfdOf

We wondered what the physical significance is of a finite plate moving with respect to a stationary plate. pdschroder : You are totally right. There is no physical significance. This arrangement can be calculated, but cannot be verified by experiment. That's why it's good that our computers only co...
by Raedchen_im_System
Sun Feb 04, 2024 4:36 pm
Forum: CfdOF / CFD
Topic: A new series of 10 tutorials about Freecad CfdOf
Replies: 39
Views: 61980

Re: A new series of 10 tutorials about Freecad CfdOf

The presenter says this is expected, but doesn't say why or how the difference should be understood. The presenter ... that's me ;) Thank you very much for your real good question concerning tutorial #3. I'll say something about how the tutorial came about. That will explain a bit: When I created t...
by Raedchen_im_System
Fri Feb 02, 2024 6:59 pm
Forum: CfdOF / CFD
Topic: freecad is not sending data to paraview
Replies: 9
Views: 751

Re: freecad is not sending data to paraview

Hi Lt72884 , CfdOf uses a Phython script for starting paraview. You can see the full command in the status-line: python script.jpg You can find that python-script and its location, when you click on "Edit" in the CfdSolver-Menu: Solver Menu.jpg In order to start paraview by hand, you have ...
by Raedchen_im_System
Thu Feb 01, 2024 9:00 pm
Forum: FEM
Topic: FEM magnetodynamics: how to calculate direct current?
Replies: 4
Views: 553

Re: FEM magnetodynamics: how to calculate direct current?

Btw. only one of the wires carries current. Usually, such simulations involve two wires with opposite currents. It's just my suggestion though. You correctly observed that my data set only contains the boundary condition voltage = 1 V and the boundary condition voltage = 0.9 V. However, I assigned ...
by Raedchen_im_System
Mon Jan 29, 2024 9:47 pm
Forum: FEM
Topic: FEM magnetodynamics: how to calculate direct current?
Replies: 4
Views: 553

Re: FEM magnetodynamics: how to calculate direct current?

... and I have a second question: As a constraint, I entered 1 V on the upper side and 900 mV on the lower side. With a length of 0.1 m and an area of 0.000028 m^2, a conductivity of 168486.7 is given. According to Ohm's law, a current of 16848.67 Ampere should occur. But where can I see this curren...
by Raedchen_im_System
Mon Jan 29, 2024 9:10 pm
Forum: FEM
Topic: FEM magnetodynamics: how to calculate direct current?
Replies: 4
Views: 553

FEM magnetodynamics: how to calculate direct current?

Hi, I'm currently doing some experiments with the new FEM workbench for Elmer / magnetodynamics. I'm currently struggling with calculating the force between 2 electrical conductors: I would like to calculate the force between these conductors, i.e. a verification of the Ampere law. If I enter AC vol...
by Raedchen_im_System
Sun Jan 28, 2024 8:51 pm
Forum: FEM
Topic: [solved] Questions concerning magnetostatics
Replies: 5
Views: 4958

Re: Questions concerning magnetostatics

The output variables include the “potential” and the “magnetic flux density”. As far as I know, the "magnetic flux density" represents the effect of the magnetic field, the formula symbol is B, the unit is Tesla. Is there an explanation, a formula drawing and a unit for “potential”? I too...
by Raedchen_im_System
Sun Jan 14, 2024 8:39 pm
Forum: CfdOF / CFD
Topic: A new series of 10 tutorials about Freecad CfdOf
Replies: 39
Views: 61980

Re: A new series of 10 tutorials about Freecad CfdOf

I had already determined that there must be a change in the mesh refinement, and I made the refinement factor for the volume refinement = 0.250, and left the surface refinement at 0.5. The mesh I got looks like yours. I downloaded and ran your updated file. While the refinements were reversed from ...
by Raedchen_im_System
Sat Jan 13, 2024 10:47 am
Forum: CfdOF / CFD
Topic: A new series of 10 tutorials about Freecad CfdOf
Replies: 39
Views: 61980

Re: A new series of 10 tutorials about Freecad CfdOf

Tutorial #15: Heat Simulation In this tutorial the heat transfer from a double-T structure is simulated. Physics is natural convection, but CFD does not distinguish between natural convection and forced convection. For this tutorial I used the following articles: https://www.cfd-online.com/Forums/o...
by Raedchen_im_System
Thu Jan 11, 2024 10:15 pm
Forum: CfdOF / CFD
Topic: A new series of 10 tutorials about Freecad CfdOf
Replies: 39
Views: 61980

Re: A new series of 10 tutorials about Freecad CfdOf

Hi blamaneid , welcome to the forum! your picture is well known to me, I got the same results. You can find my picture here: https://forum.freecad.org/viewtopic.php?t=74533#p652605 . The reason is that there was a change in CfMesh, or, to be more precise, in the mesh refinement. In the old version, ...