CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   FLOW-3D (http://www.cfd-online.com/Forums/flow-3d/)
-   -   modelling turbin/propeller (http://www.cfd-online.com/Forums/flow-3d/27281-modelling-turbin-propeller.html)

Fathan November 11, 2008 09:41

modelling turbin/propeller
 
Does anybody cauld show or share about prepin file in modelling turbine or propeller movement dou to current?

best regard, FATHAN R Student of ocean Eng.

Stefano November 17, 2008 04:59

Re: modelling turbin/propeller
 
hello Fathan, I think that in the official FlowScience User Site, if you have access to it, you can find a collection of prepin files and the one that you are looking for also.

fathan November 17, 2008 05:23

Re: modelling turbin/propeller
 
thank you, i'll try it.. Actually my FlOW3d is from my lecturer that for my Final Exam for my graduate,..

Stefano November 17, 2008 05:39

Re: modelling turbin/propeller
 
by the way, you can easly model your problem, just importing your moving propeller and then setting it: - as "prescribed motion" if you want to move the propeller, and the fluid will move as consequence. - as "coupled motion" along the propeller axis, if you want to move the fluid, and the propeller will move as consequence.

steven December 3, 2008 07:50

Re: modelling turbin/propeller
 
hello

i also have a problem in my propeller simulation

the mesh is terrible...........

i import the STL model in the flow 3d and set it up very easy but the results are terible... the propeller has nothing to do with the propeller that i import! i try to put better mesh , more small , but it needs more than 16 giga ram... can i do something to make better mesh?

thank a lot steven

Stefano December 3, 2008 10:58

Re: modelling turbin/propeller
 
if you are sure that the problem is not a bad-generated stl, then you have to make sure to put at least one cell in the thickness of the propeller blade. One cell should be enough. With one cell in the thickness how many cells do you have? Is it a GMO?

steve December 4, 2008 00:20

Re: modelling turbin/propeller
 
with one cell i get 2 000 000 cells..... and the workstation can not run it

how can i see if i have bad stl?

Stefano December 4, 2008 03:33

Re: modelling turbin/propeller
 
2 000 000 of cells are not a high number, it should works on standard machines with 2gb of ram. Does FLOW-3D tells you that you don't have enough memory? To check the stl the best is 'admesh' a program that run only under Linux, or Magix (or something like this) if you are under Windows.

steven December 4, 2008 15:44

Re: modelling turbin/propeller
 
yes the software tells me that i do not have enough ram, my workstation has 8 giga and 8 cpus....

i chech the stl and i found some mistakes so i did that once again and now i do not have any mistakes , but even of that the model does not run with more than 500 000 cells..

any idea what is not correct???

ps i have a 32 version of the software (v9.2 32bit)

thanks a lot for the help steven

Stefano December 5, 2008 03:45

Re: modelling turbin/propeller
 
it is very strange. The problem then is not the propeller, but is the memory managment or something like this... 500 000 cells are a very common-low number, and your work station could handle bigger problems! (32bit also can manage that number of cells) I don't know. You should check how much ram you have free. Somewhere here in this forum I've read about a similar problem, and Micheal says to check the file paging of windows.

michael barkhudarov December 6, 2008 01:35

Re: modelling turbin/propeller
 
One other thing to check, perhaps, is how many triangles are there in the stl file? If a GMO object represents a GMO component, all its triangles are stored in memory for faster execution. Several million triangles may be a problem even if the mesh is relatively small.

Michael

quray February 5, 2009 01:55

smal pico hydro design
 
we living in smal village in west sumatra, since long time we have no electricite, in our village thereis smal canal with 2m head and 20 lt/dt of debit. can we have the design/drawing for the smal pcohydro with propeler turbin or any type of turbin are suitable for this condition, we like to have 500 W

Fathan February 6, 2009 10:16

Re: smal pico hydro design
 
hello Quray, thats for feasibility need more calculation to get 500 W, but in padang had installed for home electricity. Are in padang have canal?


fathan February 23, 2009 07:27

Re: smal pico hydro design
 
hay quray, i know in west java was installed microhidro turbine so, of course you can installed that in padang..

sakthivel February 24, 2009 02:48

Re: modelling turbin/propeller
 
the full detail for pico hydro propeller turbine design detail please........


All times are GMT -4. The time now is 22:00.