Learning Forum

[al al]

hello 

 

first,  why when I reterun to a project that I bild yesterday or when I try deffine a new metiriel i alweyes get this. I take my modle from solid and when I dont change matiriel its fine

 

second, I what to cheack the effect of air pocket on my thermal analys (there is no air flow, the air is static) so as I show in the next pic (I circled it in red)

 I add to my box anther layer of shell metiriel. do I need to defined that the inside of the air pocket I have a static air? or the ansys know alone that if I dont define metiriel in a empty space (not on my geometry) its air?

[Rob]

Which solver are you using as the graphics don't look like Fluent or CFX. 

[al al]

Hi

 

Im using with stady state thermal

I put heat flux from the wall and want to cheak the influce of the air isulation on the heat inside 

[Rob]

I suspect you need to use fluid elements then, but as the fluids team don't use Mechanical you may find asking in the appropriate space to be more useful. 

[al al]

ok thanks, how would you reccomend to do it in CFD I dont realy familier with this and I would happy to learn

and I would appriciate if you can tell me the reson of why I get this

every time I change material or try reopen a project

[al al]

another question 

I need steady state

does CFD works can supply me this?

[Rob]

CFD will work in steady state, and will handle both the flow in the cavity and heat transfer in the solids. Have a look in Learning > Fluids to see what's possible. 

I have no idea re the geometry and don't know if that's a geometry option you've picked or something in Mechanical. 

[al al]

hope it will be nice to learn cfd 

Thanks for helping

[Rob]

If you can drive the CFD codes and understand how they work then Mechanical is relatively easy if you have any basic understanding of the theory. In CFD we need consider convection and diffusion as well as conduction (if it's hot) on a (generally) fixed mesh; Mechanical just has conduction on what might be a semi-automatically deforming mesh. 

As a Chemical Engineer (OK, I graduated in the mid '90s) I have little to no knowledge of the bendy stuff so whilst I can switch on the Mechanical solver and make it do simple stuff I really don't know what I'm doing: my colleagues will support that! 

[al al]

if you can give me links for courses that can help me to learn cfd I will apreciate it 

I dont need the theoretical staff, only how to define things in the simulation (I mechanical engeeniring student)

I just cant find stuff that help me to work with it

[al al]

Hi anther question

I saw that there are two options (I think) of cfd

the first is from the workbench

the second is ansys fluent

each one opening to me a diffrent options

wich one should I work with?

Ty