regarding pump analysis

tarang · April 17, 2012, 00:27

pls tell me that how can i define the density of blade material in CFX.
I have designed the pump in bladegen, Meshing in turbogrid and analysis in cfx. I h've defined blade as wall but i/m unable to assign density if the blade material.

also tell me that will maximum element volume ratio 17 will create any problem in analysis?

ghorrocks · April 17, 2012, 01:18

What type of simulation are you doing? The blade density is only important if it is an FSI simulation, or if you are working out blade inertia properties for transient behaviour. Are you doing this?

There is no general as to whether vol ratio 17 will cause a problem. Simple flows it is fine, complex flows (eg multiphase) it may be a problem.

tarang · April 17, 2012, 02:34

simulation is on effect of silt (sand) on impeller (blades) of pump.
I have to study silt erosion effect on blades of pump . Yes multiphase.

can you tell me how i can remove errors in meshing (some tools, tricks etc)

tarang · April 17, 2012, 02:49

i just want to study the effect of erosion in blades made of cast iron..so i want to specify density of material

ghorrocks · April 17, 2012, 06:22

I am not very familiar with the erosion models, but after a quick look through the documentation it appears solid density is not a parameter used in the model. It uses an empirical erosion factor, some reference velocities and an angle. If you do not know these poarameters for your material you are going to have to do a literature search to find it. Otherwise just use the values listed in the documentation.

April 17, 2012, 00:27	regarding pump analysis	#1
tarang New Member tarang Join Date: Feb 2012 Posts: 9 Rep Power: 14	pls tell me that how can i define the density of blade material in CFX. I have designed the pump in bladegen, Meshing in turbogrid and analysis in cfx. I h've defined blade as wall but i/m unable to assign density if the blade material. also tell me that will maximum element volume ratio 17 will create any problem in analysis?

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April 17, 2012, 01:18		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	What type of simulation are you doing? The blade density is only important if it is an FSI simulation, or if you are working out blade inertia properties for transient behaviour. Are you doing this? There is no general as to whether vol ratio 17 will cause a problem. Simple flows it is fine, complex flows (eg multiphase) it may be a problem.

April 17, 2012, 02:34		#3
tarang New Member tarang Join Date: Feb 2012 Posts: 9 Rep Power: 14	simulation is on effect of silt (sand) on impeller (blades) of pump. I have to study silt erosion effect on blades of pump . Yes multiphase. can you tell me how i can remove errors in meshing (some tools, tricks etc)

April 17, 2012, 02:49		#4
tarang New Member tarang Join Date: Feb 2012 Posts: 9 Rep Power: 14	i just want to study the effect of erosion in blades made of cast iron..so i want to specify density of material

April 17, 2012, 06:22		#5
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	I am not very familiar with the erosion models, but after a quick look through the documentation it appears solid density is not a parameter used in the model. It uses an empirical erosion factor, some reference velocities and an angle. If you do not know these poarameters for your material you are going to have to do a literature search to find it. Otherwise just use the values listed in the documentation.