Help: Negative Volume

December 22, 2005, 06:04

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I have constructed a model of the furnace. In this when i mesh one of the volume and then summarize the meshed volume then it shows that the meshed volume is negative volume. Please tell me the way to remove the negative volume.Does this negative volume has any effect when i export the model in Fluent and carry out the analysis over there. Thank you

December 22, 2005, 06:17

If you have a negative voulume, Fluent will diverge normally at the first iteration.

The only way to remove a negative volume is to remesh.

December 22, 2005, 06:38

i have tried all type of the meshing in the negative volume but it doesnot disappear.. so i created virtual volume in the negative volume and meshed it. then negative volume disappeared. is this method correct?

December 22, 2005, 10:59

are u using symmetry? KP

December 23, 2005, 00:22

No i am not using symmtry.

December 23, 2005, 04:04

For myself, i change size parameter or something else before remeshing.

December 23, 2005, 05:08

I have change the size parameter but still I am getting the negative volume.

December 23, 2005, 05:13

Do you clean your cad geometry after import?

December 24, 2005, 05:59

Thanks atually i made the geomtry in Gambit it self. it is neccessary.

December 22, 2005, 06:04	Help: Negative Volume	#1
MANOJKUMAR Guest Posts: n/a	Sponsored Links I have constructed a model of the furnace. In this when i mesh one of the volume and then summarize the meshed volume then it shows that the meshed volume is negative volume. Please tell me the way to remove the negative volume.Does this negative volume has any effect when i export the model in Fluent and carry out the analysis over there. Thank you

December 22, 2005, 06:17	Re: Help: Negative Volume	#2
HVN Guest Posts: n/a	If you have a negative voulume, Fluent will diverge normally at the first iteration. The only way to remove a negative volume is to remesh.

December 22, 2005, 06:38	Re: Help: Negative Volume	#3
MANOJKUMAR Guest Posts: n/a	i have tried all type of the meshing in the negative volume but it doesnot disappear.. so i created virtual volume in the negative volume and meshed it. then negative volume disappeared. is this method correct?

December 22, 2005, 10:59	Re: Help: Negative Volume	#4
KP Guest Posts: n/a	are u using symmetry? KP

December 23, 2005, 00:22	Re: Help: Negative Volume	#5
MANOJKUMAR Guest Posts: n/a	No i am not using symmtry.

December 23, 2005, 04:04	Re: Help: Negative Volume	#6
HVN Guest Posts: n/a	For myself, i change size parameter or something else before remeshing.

December 23, 2005, 05:08	Re: Help: Negative Volume	#7
MANOJKUMAR Guest Posts: n/a	I have change the size parameter but still I am getting the negative volume.

December 23, 2005, 05:13	Re: Help: Negative Volume	#8
HVN Guest Posts: n/a	Do you clean your cad geometry after import?

December 24, 2005, 05:59	Re: Help: Negative Volume	#9
MANOJKUMAR Guest Posts: n/a	Thanks atually i made the geomtry in Gambit it self. it is neccessary.

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