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

Forum: Main CFD Forum November 8, 2015, 01:38

Replies: 28 How to check size scale effect in a butterfly valve Views: 2,055 Posted By bejanyar Thank you. In case of adding compressibility to... Thank you. In case of adding compressibility to vapor i used similar formula to liquid phase. By knowing that the density of water vapor is 0.023865 and the Bulk Modulus of water vapor is 3011 . ...

Forum: Main CFD Forum November 7, 2015, 16:09

Replies: 28 How to check size scale effect in a butterfly valve Views: 2,055 Posted By bejanyar Ok dear fresty. :) It worked. The expression... Ok dear fresty. :) It worked. The expression you told for change density by pressure give some error to me. I replaced "p" with " Pressure" and it worked. 997 [kg m^-3]/(1-(Pressure -101325[N...

Forum: Main CFD Forum November 6, 2015, 15:28

Replies: 28 How to check size scale effect in a butterfly valve Views: 2,055 Posted By bejanyar If you want the truth , No , I couldn't apply... If you want the truth , No , I couldn't apply compressibility to my model. I dont how to do it. :( In fluent there is an option for compressibility , but i couldn't find it in CFX.

Forum: Main CFD Forum November 4, 2015, 14:56

Replies: 28 How to check size scale effect in a butterfly valve Views: 2,055 Posted By bejanyar I tried to find some topic about bubble transfer... I tried to find some topic about bubble transfer variable in CFX in forums. But nothing special i found. I will continue to search but if you know it i'll be happy if you tell it. :) By knowing...

Forum: Main CFD Forum November 4, 2015, 13:17

Replies: 28 How to check size scale effect in a butterfly valve Views: 2,055 Posted By bejanyar You mean i should use compressible flow... You mean i should use compressible flow condition ? For both water and water vapor ? I found from some article that bigger valve has a bigger cavitation. This cause from bigger space for bubble...

Forum: Main CFD Forum November 4, 2015, 11:59

Replies: 28 How to check size scale effect in a butterfly valve Views: 2,055 Posted By bejanyar I am using 2 phase model with two fluid : 1 -... I am using 2 phase model with two fluid : 1 - Water at 25 Celsius 2- Water vapor at 25 Celsius I defined both of them incompressible. You said : "change in area at constant pressure drop would...

Forum: Main CFD Forum November 4, 2015, 11:32

Replies: 28 How to check size scale effect in a butterfly valve Views: 2,055 Posted By bejanyar Ok fresty . I saw my reference and it has this... Ok fresty . I saw my reference and it has this formula for calculating Cd: Cd = V / sqrt (2*g*H + v^2) and my ansys formula is this . About using "areaAve" instead of "ave" i will check it. I...

Forum: Main CFD Forum November 4, 2015, 10:28

Replies: 28 How to check size scale effect in a butterfly valve Views: 2,055 Posted By bejanyar @fresty: I have a reference experimental result... @fresty: I have a reference experimental result for a 120 inch butterfly valve. My 120 inch CFD valve in OK with that experiment. But in other size no significant change in result were observed.

Forum: Main CFD Forum November 3, 2015, 07:40

Replies: 28 How to check size scale effect in a butterfly valve Views: 2,055 Posted By bejanyar Thank you for your answer Sarang. 1. I am using... Thank you for your answer Sarang. 1. I am using SST turbulence model with automatic wall function. If you mean Reynolds number for Re , It is different for one size to another. For example...

Forum: Main CFD Forum October 30, 2015, 15:51

Replies: 28 How to check size scale effect in a butterfly valve Views: 2,055 Posted By bejanyar massFlow()@inlet = 5477.53 [kg s^-1] ... massFlow()@inlet = 5477.53 [kg s^-1] massFlow()@outlet = -5477.13 [kg s^-1] So it correct i think. ---- I attached my mesh on valve position. I think it is about 20 cells between valve and...

Forum: Main CFD Forum October 30, 2015, 15:31

Replies: 28 How to check size scale effect in a butterfly valve Views: 2,055 Posted By bejanyar Yes , I am using steady state solver and my runs... Yes , I am using steady state solver and my runs converged to 1e-6 without no problem. I attached my model picture for you. I calculate Cd by this formula : ave(Fluid...

Forum: Main CFD Forum October 30, 2015, 15:12

Replies: 28 How to check size scale effect in a butterfly valve Views: 2,055 Posted By bejanyar Ok Sarang. So what is problem that i get... Ok Sarang. So what is problem that i get similar result in same geometry in different size ? ------- Case 1 : Inlet Pressure : 200000 Pa Outlet pressure : 101325 pa Valve size : 36 inch Valve...

Forum: Main CFD Forum October 30, 2015, 02:48

Replies: 28 How to check size scale effect in a butterfly valve Views: 2,055 Posted By bejanyar No bruno , I am not comparing two geometries. I... No bruno , I am not comparing two geometries. I am comparing one geometry by two different size. Everything should be same in two size and i only want to find size changing effect on cavitation...

Forum: Main CFD Forum October 22, 2015, 14:45

Replies: 28 How to check size scale effect in a butterfly valve Views: 2,055 Posted By bejanyar No one has any idea ??? :( No one has any idea ??? :(

Forum: Main CFD Forum October 21, 2015, 04:53

Replies: 28 How to check size scale effect in a butterfly valve Views: 2,055 Posted By bejanyar How to check size scale effect in a butterfly valve Hello. I want to compare a 12 inch butterfly valve to a 36 in butterfly valve and find what differences occurs only by changing size specially the discharge coefficient and cavitation index. I...

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