# Lobe pump

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 March 18, 2015, 07:35 Lobe pump #1 New Member   Chetan Join Date: Mar 2015 Posts: 7 Rep Power: 3 Dear all, I am trying to solve a problem of lobe pump. for devlopement i used immersed solid method for both the lobes. i am facing problem in. 1. In giving rotation to both the lobes as their rotation axis is not global axis. 2. If use two point method than how to locate those two points? 3. I have selected mass flow inlet and static pressure outlet with symmetry as boundary condition. 4. While solving problem my solver ges excited with " non zero exit error-2". Guide me how to proceed with or without immerged body problem. thanks.

 March 18, 2015, 18:22 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,832 Rep Power: 100 Have you done the CFX tutorial examples? There is an example of exactly this sort of simulation. Have a think about whether a mass flow inlet is appropriate. I would have thought a pressure inlet (or opening) would be more appropriate, as the flow is likely to be a bit pulsating.

 March 19, 2015, 05:17 #3 New Member   Chetan Join Date: Mar 2015 Posts: 7 Rep Power: 3 Dear sir, I think yiu are right but i am facing problem at the innitial stage only in terms of defining rotation axis for both the lobes... can you please guide how to locate he rotation axis which is other than global axis?

 March 31, 2015, 03:40 hi #4 New Member   allan Join Date: Mar 2015 Posts: 3 Rep Power: 3 Dear sir, I think wo do the same thing, my job is about a helical gear pump, if you join the QQ group (i built it for this reason) 337969380 , i think we will have a good discussion, or you can send me email 619313616@qq.com ,i hope we'll have a good talk!

 April 23, 2015, 09:19 Maybe twinmesh can help you #5 Member   Jan Join Date: Jul 2013 Location: Berlin - Germany Posts: 35 Rep Power: 5 Hallo. If you want to calculate lobe pumps with ANSYS CFX or ANSYS Fluent, I want to recommend the program Twinmesh, developed by CFX Berlin. www.twinmesh.com This program allowes you to generate the grids for each timestep and provides the complette setup of your simulation for ANSYS CFX. The way using different grids will provide much better results as using immersed solids. As the meshes have the same topology, no interpolation between the timesteps is needed. There are also tutorials for the usage of twinmesh and the calculation of lobe pumps in ANSYS CFX included. Regards, Jan Smedseng unclewallcn likes this.

April 23, 2015, 21:39
hi
#6
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allan
Join Date: Mar 2015
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Quote:
 Originally Posted by Jan Smedseng Hallo. If you want to calculate lobe pumps with ANSYS CFX or ANSYS Fluent, I want to recommend the program Twinmesh, developed by CFX Berlin. www.twinmesh.com This program allowes you to generate the grids for each timestep and provides the complette setup of your simulation for ANSYS CFX. The way using different grids will provide much better results as using immersed solids. As the meshes have the same topology, no interpolation between the timesteps is needed. There are also tutorials for the usage of twinmesh and the calculation of lobe pumps in ANSYS CFX included. Regards, Jan Smedseng
thank your recommendation,i wanted to have a try once ,but i do not have the program,and i am a student ,can not afford such a expensive software,even no matter how i want.

 April 23, 2015, 21:50 #7 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,832 Rep Power: 100 Then the immersed solids approach is likely to be your best path forward. It has limitations which you should be aware of, but is by far the easiest way of modelling these sort of pumps.

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