Mixing time:Tracer disappearing

May 19, 2003, 11:29

Hi all,

I went for an overkill!! And I guess some people will disagree with my actions. Here is a summary of my systematic actions (done one at atime). -Refined the grids -doubled the default inner iterations -Used courant no of 5 and backward quadratic time scheme (as recommended by Jan, Thanks).

Then all the above set with.. -24,000 Total iterations!!! (that is NSTEP=600, MAXIT=40, DT=0.002sec, 60 impeller rev.)

Convergence seems better (It is still going on since Saturday 3.00pm, it is now 5.10 pm Monday).

As I had mentioned before, convergence is just one of the indicator of a good solution. I will inject my tracer and see what comes out now.

I will filter later some of the un necessary loads I have given my machine.

Many thanks John, Jan and KubaB. I will be back again with the tracer proper, after such a long suspension of the same.

regards nyatoto

behruz · July 13, 2013, 10:45

hi
i am working in stirred tank . i want to calculate mixing time with tracer
i have not any idea to do it.can u help me?
i work with fluent.

behruz · July 13, 2013, 11:02

hi all
i want to calculate mixing time with tracer.i do not have any idea to do it. can any one help me ? i need it extremly
thanks

behruz · July 13, 2013, 11:06

hi all
i want to calculate mixing time in stirred vessel with tracer
i do not have any idea to do it.can any one help me?
thanks

behruz · July 13, 2013, 11:12

hi all
i want to calculate mixing time in stirred vessel with tracer
i do not have any idea to do it.can any one help me?
thanks

behruz · July 13, 2013, 11:19

hi all
i want to calculate mixing time in stirred vessel with tracer
i do not have any idea to do it.can any one help me?
thanks

behruz · July 13, 2013, 11:22

hi all
i want to calculate mixing time in stirred vessel with tracer
i do not have any idea to do it.can any one help me?i work via fluent
thanks

ghorrocks · July 13, 2013, 18:44

Try the fluent forum. CFX questions get answered here.

behruz · July 16, 2013, 07:44

thanks ghorrocks
can u give me exactly this address?( i do not found it)

May 19, 2003, 11:29	Re: Mixing time:Tracer disappearing	#21
Nyatoto Guest Posts: n/a	Hi all, I went for an overkill!! And I guess some people will disagree with my actions. Here is a summary of my systematic actions (done one at atime). -Refined the grids -doubled the default inner iterations -Used courant no of 5 and backward quadratic time scheme (as recommended by Jan, Thanks). Then all the above set with.. -24,000 Total iterations!!! (that is NSTEP=600, MAXIT=40, DT=0.002sec, 60 impeller rev.) Convergence seems better (It is still going on since Saturday 3.00pm, it is now 5.10 pm Monday). As I had mentioned before, convergence is just one of the indicator of a good solution. I will inject my tracer and see what comes out now. I will filter later some of the un necessary loads I have given my machine. Many thanks John, Jan and KubaB. I will be back again with the tracer proper, after such a long suspension of the same. regards nyatoto

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July 13, 2013, 10:45		#22
behruz New Member behrooz Join Date: Mar 2013 Posts: 24 Rep Power: 13	hi i am working in stirred tank . i want to calculate mixing time with tracer i have not any idea to do it.can u help me? i work with fluent.

July 13, 2013, 11:02		#23
behruz New Member behrooz Join Date: Mar 2013 Posts: 24 Rep Power: 13	hi all i want to calculate mixing time with tracer.i do not have any idea to do it. can any one help me ? i need it extremly thanks

July 13, 2013, 11:06		#24
behruz New Member behrooz Join Date: Mar 2013 Posts: 24 Rep Power: 13	hi all i want to calculate mixing time in stirred vessel with tracer i do not have any idea to do it.can any one help me? thanks

July 13, 2013, 11:12		#25
behruz New Member behrooz Join Date: Mar 2013 Posts: 24 Rep Power: 13	hi all i want to calculate mixing time in stirred vessel with tracer i do not have any idea to do it.can any one help me? thanks

July 13, 2013, 11:19		#26
behruz New Member behrooz Join Date: Mar 2013 Posts: 24 Rep Power: 13	hi all i want to calculate mixing time in stirred vessel with tracer i do not have any idea to do it.can any one help me? thanks

July 13, 2013, 11:22		#27
behruz New Member behrooz Join Date: Mar 2013 Posts: 24 Rep Power: 13	hi all i want to calculate mixing time in stirred vessel with tracer i do not have any idea to do it.can any one help me?i work via fluent thanks

July 13, 2013, 18:44		#28
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,708 Rep Power: 143	Try the fluent forum. CFX questions get answered here.

July 16, 2013, 07:44		#29
behruz New Member behrooz Join Date: Mar 2013 Posts: 24 Rep Power: 13	thanks ghorrocks can u give me exactly this address?( i do not found it)