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Old   February 27, 2006, 09:11
Default GAMBIT mesh please help me
  #1
naus
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Hello, I have rectangulaire room with a table, I want to mesh the volume without table,

I have create the volume of the room V1 then I have create the volume of the room V2 then V3=V1-V2,

I mesh V3 with tet hydrid,but when I want to export it I found ERROR : An incorrect mesh has been store... although my mesh has successfully done.

Where is the probleme ?

please helpe me.
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Old   February 27, 2006, 09:38
Default Re: GAMBIT mesh please help me
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mAx
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take care that your v2 isn't still in your geometry. In the substract boolean operation, you have the possibility to retain (or not) the object with which you will substract. In other words look at you whole geometry, by shading it. YOu should have only one volume
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Old   February 27, 2006, 15:10
Default Re: GAMBIT mesh please help me
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naus
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HI mAx, thank you for your help,I will do what you had suggest to me.

now please, in bondary condition (always with GAMBIT) must I declare table's surfaces(as they belong to V3) like interface???? knowing that I have declared all the walls,the inlet and the outlet diffuser(I have a ventiled room).

I'm new in GAMBIT/FLUENT please enlighten me.

naus
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Old   February 28, 2006, 02:35
Default Re: GAMBIT mesh please help me
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mAx
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It depends on what you will calculate. But anyway you can define the table sufaces as wall (but rename them with a special name, for distinguish them with default walls) After that you always can change the Boundary Conditions in Fluent. Important in Gambit ist that you distinguish your surfaces. Hope it helps
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Old   February 28, 2006, 06:49
Default Re: GAMBIT mesh please help me
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naus
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I will calculate the aeraulic flow around the table,

it is just to define all table surface's (at the same time) as interface in GAMBIT??
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Old   February 28, 2006, 07:07
Default Re: GAMBIT mesh please help me
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mAx
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you can group the faces from the table as one entity. Then in Fluent you can compute what you want on this entity. explain why do you want to define your table as interface? Do you have conduction?
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Old   February 28, 2006, 07:47
Default Re: GAMBIT mesh please help me
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naus
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I define my table as interface beacause I have not data about it.and in BC (FLUENT)there is not data to define with this type. it is right?
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Old   February 28, 2006, 08:07
Default Re: GAMBIT mesh please help me
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mAx
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if you only will to compute the force generated by the flow on the table, you have to set your table as wall
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Old   February 28, 2006, 09:51
Default Re: GAMBIT mesh please help me
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naus
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I set it as wall,you have right. When I export to FLUENT, I found this message of error: Error: access: unbound variable Error Object: phase-domain? it's a serious probleme??
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Old   February 28, 2006, 10:58
Default Re: GAMBIT mesh please help me
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mAx
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phase-domain? are you working with multiphase?
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Old   February 28, 2006, 11:01
Default Re: GAMBIT mesh please help me
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matt
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if u do the tutorials here http://unix.eng.ua.edu/Fluent.Inc/tg...guide/tg03.htm

u will not have any problems with your case...
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Old   February 28, 2006, 11:18
Default Re: GAMBIT mesh please help me
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naus
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no I work only with the humid air in my conditionned room.

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Old   February 28, 2006, 11:36
Default Re: GAMBIT mesh please help me
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mAx
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ok I got it. You certainly have one or more boundary name with a blank. for instance: WALL RED should be WALL_RED
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Old   February 28, 2006, 14:00
Default Re: GAMBIT mesh please help me
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naus
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thanks matt for tutorials.
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Old   March 1, 2006, 05:44
Default Re: GAMBIT mesh please help me
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naus
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thanks a lot mAx you are right, can you lighten me in FLUENT too! I will use in addition to model of energy the model of species because I would to display RELATIVE HUMIDITY and with this model I can, I have read it in chapiter 13 section 4, but I can't understand well how to do with mixture of dry air and h2o vapour(my fluid of interio is humid air).
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Old   March 1, 2006, 06:40
Default Re: GAMBIT mesh please help me
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mAx
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i would advice you to do the tutorial about multiphase
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Old   March 2, 2006, 03:32
Default Re: GAMBIT mesh please help me
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naus
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j'ai du mal à m'exprimé en anglais!!

bj,comment je peus choisir les bonnes BC appropriée a mon cas, sachant que je suis en 3D avec un écoulement turb modele k-e, j'ai utilisé en plus de l'équation de l'énergie, le modele"specises",j'ai la convection naturelle dominante. merci.

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