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Showing results 1 to 15 of 15 Search took 0.00 seconds. Search: Posts Made By: MrAndersDk

Forum: OpenFOAM Running, Solving & CFD October 11, 2018, 03:23

Replies: 30 Sudden contration Views: 2,088 Posted By MrAndersDk I actually think they write that S is the area... I actually think they write that S is the area ratio of the two pipe section. C is K or at least closely related to it.

Forum: OpenFOAM Running, Solving & CFD October 11, 2018, 02:20

Replies: 30 Sudden contration Views: 2,088 Posted By MrAndersDk thanks for the reply. I think the equation... thanks for the reply. I think the equation you linked to are the same as mine, rewritting for mass flow instead of velocity, and expressing v_1 through v_2 using the area ratios (constant volume...

Forum: OpenFOAM Running, Solving & CFD October 10, 2018, 17:29

Replies: 30 Sudden contration Views: 2,088 Posted By MrAndersDk Tobias you are too kind, I've never expected you... Tobias you are too kind, I've never expected you to do all that. I'm amazed by this communitys, will to help me, even though I know almost nothing, and asks stupid questions. Not just you Tobias but...

Forum: OpenFOAM Running, Solving & CFD October 10, 2018, 07:06

Replies: 30 Sudden contration Views: 2,088 Posted By MrAndersDk Here is a link to all the files: ... Here is a link to all the files: https://drive.google.com/file/d/11-wae7UwDtzA_a_zswLQAhsGi9EO9bec/view?usp=sharing My problem is that K_2 should be around 0.5, but my simulation...

Forum: OpenFOAM Running, Solving & CFD October 10, 2018, 02:58

Replies: 30 Sudden contration Views: 2,088 Posted By MrAndersDk Hello my files are here. I've tried many... Hello my files are here. I've tried many different grids and schemes but all seems to reproduce roughly the same result. It could be I should try a small rounding of the transition and corners to...

Forum: OpenFOAM Running, Solving & CFD October 9, 2018, 05:29

Replies: 30 Sudden contration Views: 2,088 Posted By MrAndersDk Thanks for all the suggestions. I've tried... Thanks for all the suggestions. I've tried to use the suggestions. First of all I've tried learning some snappyHexMesh to genererate a better hexagonal mesh, and elongated the pipe length. I now...

Forum: OpenFOAM Running, Solving & CFD October 4, 2018, 02:32

Replies: 30 Sudden contration Views: 2,088 Posted By MrAndersDk Thank you so much for taking your time to help me... Thank you so much for taking your time to help me with such a detailed answer. Just a couple of questions: The boundary layer has to establish first, using a fixedValue will not give you a...

Forum: OpenFOAM Running, Solving & CFD October 4, 2018, 02:02

Replies: 30 Sudden contration Views: 2,088 Posted By MrAndersDk Thanks for the great link. I was actually looking... Thanks for the great link. I was actually looking into using hex mesh. I guess the work flow will then be to prepare stl files in salome, and then use snappyHexMesh to create the mesh.

Forum: OpenFOAM Running, Solving & CFD October 3, 2018, 08:35

Replies: 30 Sudden contration Views: 2,088 Posted By MrAndersDk Hello If I don't use wallfunctions what... Hello If I don't use wallfunctions what should i use for type in the k and epsilon files?

Forum: OpenFOAM Running, Solving & CFD October 3, 2018, 06:01

Replies: 30 Sudden contration Views: 2,088 Posted By MrAndersDk Yeah, I agree. This is a preliminary study to see... Yeah, I agree. This is a preliminary study to see how one can work with OpenFOAM. I think it is possible to study the workflow. That is how will we take a given component from design, to mesh, to...

Forum: OpenFOAM Running, Solving & CFD October 3, 2018, 03:13

Replies: 30 Sudden contration Views: 2,088 Posted By MrAndersDk The reason I used Salome to do the mesh, was... The reason I used Salome to do the mesh, was because I'm investigation how a OpenFOAM workflow can be implemented at our company, and in general the geometries will be very complex. I tried going...

Forum: OpenFOAM Running, Solving & CFD October 2, 2018, 07:11

Replies: 30 Sudden contration Views: 2,088 Posted By MrAndersDk Should I actually calculate different k and... Should I actually calculate different k and epsilon for the pipe walls with the large diameter and the small diameter?

Forum: OpenFOAM Running, Solving & CFD October 2, 2018, 06:27

Replies: 30 Sudden contration Views: 2,088 Posted By MrAndersDk The Reynolds number is very high. I think in the... The Reynolds number is very high. I think in the region of 200000 - 300000. You don't mean that it should be set somewhere in OpenFOAM do you? Or do you mean when I calculated the k and epsilon...

Forum: OpenFOAM Running, Solving & CFD October 2, 2018, 04:23

Replies: 30 Sudden contration Views: 2,088 Posted By MrAndersDk Thanks for the suggestions. I checked the yPlus... Thanks for the suggestions. I checked the yPlus values (didn't know about them, thanks for that), and they are way to high. Also I agree that the mesh is not good. I use salome to mesh, and I'm...

Forum: OpenFOAM Running, Solving & CFD October 1, 2018, 08:48

Replies: 30 Sudden contration Views: 2,088 Posted By MrAndersDk Sudden contration Hello I'm trying to learn to use OpenFOAM. For that purpose I tried to simulate a sudden contration of a circular pipe. I go from 80 mm to 40 mm see image below (clipped trough the half), where...

Showing results 1 to 15 of 15

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