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Showing results 1 to 25 of 27 Search took 0.00 seconds. Search: Posts Made By: klio

Forum: OpenFOAM Running, Solving & CFD April 19, 2012, 15:59

Replies: 54 BC -> k e simpleFoam Views: 5,525 Posted By klio hmm works not that bad! It took me a little time... hmm works not that bad! It took me a little time to find out how to handle with atmospheric pressure but soonic gave me the input I needed to solve a simple case (flow in a pipe again!!!):)

Forum: OpenFOAM Running, Solving & CFD April 19, 2012, 09:58

Replies: 54 BC -> k e simpleFoam Views: 5,525 Posted By klio Yes you have to take totalPressure because if you... Yes you have to take totalPressure because if you just fix the Value in field p you fix the static pressure. you can calculate the total pressure in the visualization tool with p0 = p*rho + rho/2 *...

Forum: OpenFOAM Running, Solving & CFD April 19, 2012, 02:59

Replies: 54 BC -> k e simpleFoam Views: 5,525 Posted By klio Did you use totalPressure at Inlet? Did you use totalPressure at Inlet?

Forum: OpenFOAM Running, Solving & CFD April 18, 2012, 08:04

Replies: 54 BC -> k e simpleFoam Views: 5,525 Posted By klio How did you get the values? Because its not... How did you get the values? Because its not very clear how fluent calculates k and epsilon! It is better you calculate them on your own!...

Forum: OpenFOAM Running, Solving & CFD April 17, 2012, 02:25

Replies: 54 BC -> k e simpleFoam Views: 5,525 Posted By klio Hi! This is the link to the new thread! ... Hi! This is the link to the new thread! http://www.cfd-online.com/Forums/openfoam-solving/99962-compressible-flow-using-buoyantsimplefoam.html But now just want to do a compressible flow but...

Forum: OpenFOAM Running, Solving & CFD April 16, 2012, 04:45

Replies: 54 BC -> k e simpleFoam Views: 5,525 Posted By klio @soonic: Do you have experience with heat... @soonic: Do you have experience with heat transfer sim?

Forum: OpenFOAM Running, Solving & CFD April 13, 2012, 06:26

Replies: 54 BC -> k e simpleFoam Views: 5,525 Posted By klio yes you are right !! I GOT IT!!!!!! @... yes you are right !! I GOT IT!!!!!! @ lobstar: What are your k and eps in fluent and what is your hydraulic diameter D? in my fluent simulation k and eps were both 1! Because of the formula...

Forum: OpenFOAM Running, Solving & CFD April 13, 2012, 03:37

Replies: 54 BC -> k e simpleFoam Views: 5,525 Posted By klio You calculated [kg]/[m]³ * [m]²/[s]² =... You calculated [kg]/[m]³ * [m]²/[s]² = [kg]/[m]*[s]² which is [pa] But may it explains this ->because of dimensions pressure inlet is u² -> u is not known but the pressure (in my case 0.5...

Forum: OpenFOAM Running, Solving & CFD April 12, 2012, 09:30

Replies: 54 BC -> k e simpleFoam Views: 5,525 Posted By klio first I just added the requred files and changed... first I just added the requred files and changed laminar Flag from RASModell to kEpsilon. Yes! I thougt i'd be a good idea not to change whats already working ;) (but may i have to if i don't get...

Forum: OpenFOAM Running, Solving & CFD April 12, 2012, 08:07

Replies: 54 BC -> k e simpleFoam Views: 5,525 Posted By klio @lobstar: if you look at the dimentions you will... @lobstar: if you look at the dimentions you will see [0 2 -2 0 0 0 0] thats m²/s² -> p [pa] / rho [kg/m³] did you use simpleFoam for the laminar calculation like soonics example?

Forum: OpenFOAM Running, Solving & CFD April 12, 2012, 04:20

Replies: 54 BC -> k e simpleFoam Views: 5,525 Posted By klio But look at this file. It's about a OF and Fluent... But look at this file. It's about a OF and Fluent comparison and also initial k & epsilon for the OF sim are much smaller (1e-15 instead of 1e-5)...

Forum: OpenFOAM Running, Solving & CFD April 12, 2012, 04:01

Replies: 54 BC -> k e simpleFoam Views: 5,525 Posted By klio hmmm... it could also be possible that the sovers... hmmm... it could also be possible that the sovers OF uses are different to Fluent and thats the reason why simulations diverge. So because of that you have to set initial conditions nearer to the...

Forum: OpenFOAM Running, Solving & CFD April 10, 2012, 11:04

Replies: 54 BC -> k e simpleFoam Views: 5,525 Posted By klio Yes I got a laminar solution and it was nearly... Yes I got a laminar solution and it was nearly correct! velocities about 0.48 instead of 0.9. and the flow was driven with the BC that you can find in the example pipe_pressure_turm of soonic. it...

Forum: OpenFOAM Running, Solving & CFD April 10, 2012, 04:06

Replies: 54 BC -> k e simpleFoam Views: 5,525 Posted By klio @lobstar: so you mean if i have an... @lobstar: so you mean if i have an inletpressure of 0.5 pa and at the outlet my pressure is 0 i just have to know the distance between them? ok so if i know the inlet value do i set this to...

Forum: OpenFOAM Running, Solving & CFD April 10, 2012, 02:31

Replies: 54 BC -> k e simpleFoam Views: 5,525 Posted By klio Hi did you find out anything? Hi did you find out anything?

Forum: OpenFOAM Running, Solving & CFD April 3, 2012, 10:23

Replies: 54 BC -> k e simpleFoam Views: 5,525 Posted By klio hmmm yes but if i set a gradient the pressure is... hmmm yes but if i set a gradient the pressure is not fixed as soonic adverted me to and then my pressure de- or increases and the velocity as well! and the tutorials are all not very helpful because...

Forum: OpenFOAM Running, Solving & CFD April 3, 2012, 09:56

Replies: 54 BC -> k e simpleFoam Views: 5,525 Posted By klio hi! @soonic: hmm ... my Model is a cube... hi! @soonic: hmm ... my Model is a cube with a 0.006 m thick pipe (0.06 m long ) at the inlet and same at the outlet. I also have calculated the k and epsilon for the model but it must work...

Forum: OpenFOAM Running, Solving & CFD April 3, 2012, 01:52

Replies: 54 BC -> k e simpleFoam Views: 5,525 Posted By klio Thinks for your help! In my case i have to... Thinks for your help! In my case i have to compare fluent with openFoam! So i got a simulation from my college with given BC. And to compare it correctly I have do set the same initial condition...

Forum: OpenFOAM Running, Solving & CFD March 30, 2012, 07:41

Replies: 54 BC -> k e simpleFoam Views: 5,525 Posted By klio Hi at all! now the Laminar model works! ... Hi at all! now the Laminar model works! But if I take the same BC as in the laminar model for the kE-Modell it doesn't work! My BC are: k & epsilon

Forum: OpenFOAM Running, Solving & CFD March 30, 2012, 02:24

Replies: 54 BC -> k e simpleFoam Views: 5,525 Posted By klio Thank you very much for this nice example. I took... Thank you very much for this nice example. I took same BC for k-e-Model and it didn't worked!

Forum: OpenFOAM Running, Solving & CFD March 29, 2012, 09:49

Replies: 54 BC -> k e simpleFoam Views: 5,525 Posted By klio Ok I'll try it thank you very much. Hope that... Ok I'll try it thank you very much. Hope that even works in k e model

Forum: OpenFOAM Running, Solving & CFD March 29, 2012, 09:16

Replies: 54 BC -> k e simpleFoam Views: 5,525 Posted By klio I think I can't really imagine how the BC at... I think I can't really imagine how the BC at inlet and outlet of U and P should be set correctly. When I take a look at the examples I can only find BC where the velocity is known. Not so in my...

Forum: OpenFOAM Running, Solving & CFD March 29, 2012, 08:57

Replies: 54 BC -> k e simpleFoam Views: 5,525 Posted By klio yes it is p/rho! My pressure is about 0.5 pa,... yes it is p/rho! My pressure is about 0.5 pa, rho is 1.225 so my PressureValue is about 0.44 an the solution is about 2000 times smaller! I also tried to set initial conditions with potentialFoam...

Forum: OpenFOAM Running, Solving & CFD March 29, 2012, 06:56

Replies: 54 BC -> k e simpleFoam Views: 5,525 Posted By klio hmmm... Thanks! But I have the Problem that... hmmm... Thanks! But I have the Problem that I just know the fix pressure value at the inlet and if I only fix the Value there, there is nothing which drives my Flow. so should I fix the value and...

Forum: OpenFOAM Running, Solving & CFD March 28, 2012, 02:37

Replies: 54 BC -> k e simpleFoam Views: 5,525 Posted By klio Ok but now i got the problem that the pressure... Ok but now i got the problem that the pressure decreases at the inlet. i thought fixed Gradient is NOT variable. Do you have an idea what goes wrong there?

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