Negative Volume Error

December 10, 2007, 12:17

i am doin an analysis of different aerofoils but am not able to procedd coz watever meshing i do i keep gettin the negative element error. i am using icem cfd wat correction should i do to rectify this?? help Plz!!

Srinivethan

December 10, 2007, 16:15

Hi,

This error is common in moving mesh - I assume you do not have any moving mesh. If you have a static mesh then you either have a very poor mesh where some elements have been turned inside out (sometimes too much smoothing can do this) or the normal vectors are wrong (this is easy fixed in ICEM).

Glenn Horrocks

December 11, 2007, 10:56

thanks but my mesh quality is fine i checked it out. and i am doin a 2d analysis as in when i am exporting from icem i am giving the z scale as 0. so basically i get a 2d structure in cfx will that be a problem???

December 11, 2007, 16:27

Hi,

No that will not work and that is where the error is coming from. You need to have a finite thickness in the z direction. Also read the FAQ: http://www.cfd-online.com/Wiki/Ansys...tion_in_CFX.3F

Glenn Horrocks

December 10, 2007, 12:17	Negative Volume Error	#1
Srinivethan Guest Posts: n/a	i am doin an analysis of different aerofoils but am not able to procedd coz watever meshing i do i keep gettin the negative element error. i am using icem cfd wat correction should i do to rectify this?? help Plz!! Srinivethan

December 10, 2007, 16:15	Re: Negative Volume Error	#2
Glenn Horrocks Guest Posts: n/a	Hi, This error is common in moving mesh - I assume you do not have any moving mesh. If you have a static mesh then you either have a very poor mesh where some elements have been turned inside out (sometimes too much smoothing can do this) or the normal vectors are wrong (this is easy fixed in ICEM). Glenn Horrocks

December 11, 2007, 10:56	Re: Negative Volume Error	#3
Srinivethan Guest Posts: n/a	thanks but my mesh quality is fine i checked it out. and i am doin a 2d analysis as in when i am exporting from icem i am giving the z scale as 0. so basically i get a 2d structure in cfx will that be a problem???

December 11, 2007, 16:27	Re: Negative Volume Error	#4
Glenn Horrocks Guest Posts: n/a	Hi, No that will not work and that is where the error is coming from. You need to have a finite thickness in the z direction. Also read the FAQ: http://www.cfd-online.com/Wiki/Ansys...tion_in_CFX.3F Glenn Horrocks

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