Defining the interface in CFX for impeller -intake

Ahmed Saeed Mansour · August 23, 2016, 22:54

Hello, how can I define the interface between the impeller and the inlet pipe in CFX?Thanks

ghorrocks · August 24, 2016, 01:38

With a GGI interface.

Ahmed Saeed Mansour · August 24, 2016, 10:50

I have to carry out a sliding mesh technique...do you think that the interface is the surface area of the pipe?

Ahmed Saeed Mansour · August 24, 2016, 12:30

Is that interface right?

ghorrocks · August 24, 2016, 20:05

It appears you have made it a periodic boundary. This does not sound correct. But I do not know what you have done so cannot say for sure.

Do the tutorials provided with CFX on rotating machinery to see how you use GGI interfaces to join domains together.

Ahmed Saeed Mansour · August 24, 2016, 20:10

Thanks, could you please provide me with the tutorials that deal with interfaces in cfx please? and what is the periodic boundary? My issue is that I don't know the method of making the assembly of the inlet pipe and the impeller to define the interface of the sliding mesh, the impeller hollow with a diameter 85 mm and this is the diameter of the inlet pipe...Am I right or I have to make some changes? I am so confused! I am sorry!
Many thanks..

turbo · August 25, 2016, 11:08

What do you mean by "sliding mesh"? You have two options for that case. One is to use the frozen rotor to get a steady-state solution. The other is the transient rotor-stator interface starting from the frozen rotor solution.

Ahmed Saeed Mansour · August 25, 2016, 11:48

Sliding mesh is a fully turbulent simulation...so we have his case and I just want to know the procedure of defining the interfaces between the inlet pipe outer surface and the impeller then the impeller and the volute...thanks

Ahmed Saeed Mansour · August 25, 2016, 14:31

I have a problem with that mesh...the inlet mesh doesn't appear....what is the problem?

Ahmed Saeed Mansour · August 25, 2016, 14:59

Okay, I have changed the inlet length of the flow path and no problem now...

Ahmed Saeed Mansour · August 25, 2016, 19:52

Anyone knows if I have to define the inlet hub and inlet shroud in the volute?...I have another volute and I have imported it as add material for the pump but I have noticed that the volute that is generated by vista CPD has 4 named selection...should I define the inlet hub and inlet shroud or the inlet and outlet only? thanks

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Setting rotating frame of referece.	RPFigueiredo	CFX	3	October 28, 2014 04:59
Problem at the interface in CFX	kwg	CFX	9	October 18, 2014 03:00
Radiation interface	hinca	CFX	15	January 26, 2014 17:11
[ICEM] Question about creating porous domain interface for CFX by ICEM	lnk	ANSYS Meshing & Geometry	0	July 20, 2012 06:40
Frozen Rotor Interface (CFX 5.5)	gilberto	CFX	4	November 14, 2001 21:07

August 24, 2016, 01:38		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	With a GGI interface.

August 24, 2016, 10:50		#3
Ahmed Saeed Mansour Senior Member Have a nice time! Join Date: Feb 2016 Location: mech.eng.ahmedmansour@gmail.com Posts: 291 Rep Power: 11	I have to carry out a sliding mesh technique...do you think that the interface is the surface area of the pipe?

August 24, 2016, 20:05		#5
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	It appears you have made it a periodic boundary. This does not sound correct. But I do not know what you have done so cannot say for sure. Do the tutorials provided with CFX on rotating machinery to see how you use GGI interfaces to join domains together.

August 24, 2016, 20:10		#6
Ahmed Saeed Mansour Senior Member Have a nice time! Join Date: Feb 2016 Location: mech.eng.ahmedmansour@gmail.com Posts: 291 Rep Power: 11	Thanks, could you please provide me with the tutorials that deal with interfaces in cfx please? and what is the periodic boundary? My issue is that I don't know the method of making the assembly of the inlet pipe and the impeller to define the interface of the sliding mesh, the impeller hollow with a diameter 85 mm and this is the diameter of the inlet pipe...Am I right or I have to make some changes? I am so confused! I am sorry! Many thanks..

August 25, 2016, 11:08		#7
turbo Senior Member Join Date: Jun 2009 Posts: 174 Rep Power: 16	What do you mean by "sliding mesh"? You have two options for that case. One is to use the frozen rotor to get a steady-state solution. The other is the transient rotor-stator interface starting from the frozen rotor solution.

August 25, 2016, 11:48		#8
Ahmed Saeed Mansour Senior Member Have a nice time! Join Date: Feb 2016 Location: mech.eng.ahmedmansour@gmail.com Posts: 291 Rep Power: 11	Sliding mesh is a fully turbulent simulation...so we have his case and I just want to know the procedure of defining the interfaces between the inlet pipe outer surface and the impeller then the impeller and the volute...thanks

August 25, 2016, 14:31		#9
Ahmed Saeed Mansour Senior Member Have a nice time! Join Date: Feb 2016 Location: mech.eng.ahmedmansour@gmail.com Posts: 291 Rep Power: 11	I have a problem with that mesh...the inlet mesh doesn't appear....what is the problem?

August 25, 2016, 14:59		#10
Ahmed Saeed Mansour Senior Member Have a nice time! Join Date: Feb 2016 Location: mech.eng.ahmedmansour@gmail.com Posts: 291 Rep Power: 11	Okay, I have changed the inlet length of the flow path and no problem now...