AnsweredAssumed Answered

Problems adding lids

Question asked by Euan Long on Jul 15, 2013
Latest reply on Jul 15, 2013 by Euan Long

Like • Show 0 Likes0
Comment • 4

I'm having problems adding lids to this part. I want to add lids on each opening (6 in total, 2 per channel through part), all of which will have boundary conditions (mass flow in to planar face entry, environmental pressure at larger exit holes). The problem is that I cannot add lids to the larger openings as they are not on a planar face.

Here is what I have tried:

For the larger ends I used "create entity" for a 3D sketch then extruded that 0.05 mm to create curved lids.
For the openings on the planar face I added lids using the add lids feature - seemed to do it but does not allow me to then apply a temperature condition to the face.

Any help appreciated as I'm new on here!

Chris Michalski Jul 15, 2013 8:51 AM

Correct Answer

What does it say when you try to add boundary conditions to those lids? My guess is "not lying on the boundary between solid and fluid" which means that your other lids do not completely close off and create a trapped hollow volume for the fluid.

With your shape I'd likely be inclined to make the lids by using the profile shown in your bottom picture and extruding a thin region all the way across (either inside or outside).

See the reply in context

Attachments

TE.SLDPRT.zip308.5 KB

No one else had this question

Outcomes

Chris Michalski Jul 15, 2013 8:51 AM

With your shape I'd likely be inclined to make the lids by using the profile shown in your bottom picture and extruding a thin region all the way across (either inside or outside).

Actions

Euan Long @ Chris Michalski on Jul 15, 2013 9:42 AM

Hi Chris,

That is a great suggestion and it worked to enclose the fluid (see the picture below for the thin feature) - thank you.

Now I am applying the boundary conditions, but cannot seem to select the inner faces of the fluid boundary. I have tried to make the contours a 3d sketch and choose that profile to apply the condition to but it didn't let me select the sketch (it has to be a surface as I understand). The sketch is highlighted below. I have also got the same problem with the holes on the planar surface - it doesn't let me select the inner circle surfaces to apply the boundary condition to. Any suggestions?

Thanks for your time, much appreciated

Actions

Chris Michalski @ Euan Long on Jul 15, 2013 9:55 AM

when you make that bounding surface it needs to re-create the features of your holes. It looks like you made one continuous solid to close off your fluid volume. If so, you need to use split lines on those surfaces in order to create the small areas on which to define the boundary conditions. This will produce the 3 circles and ellipsoids that define the inlet/outlet geometry.

Actions

Euan Long @ Chris Michalski on Jul 15, 2013 12:06 PM

I'd not heard of split lines before, gave it a go and yes it worked thank you. However I later realised that when making the thin extrude that if I merged the thin feature with the component it'd then allow me to later select the smaller inside surfaces for boundary conditions anyway! I'm not sure why I didn't do this in the first place from your advice. Now I have a working model, many thanks for your advice Chris!

Euan

Actions

4 Replies

Chris Michalski Jul 15, 2013 8:51 AM
Unmark Correct
Correct Answer
What does it say when you try to add boundary conditions to those lids? My guess is "not lying on the boundary between solid and fluid" which means that your other lids do not completely close off and create a trapped hollow volume for the fluid.

With your shape I'd likely be inclined to make the lids by using the profile shown in your bottom picture and extruding a thin region all the way across (either inside or outside).
Like • Show 1 Like1
Actions
- Euan Long @ Chris Michalski on Jul 15, 2013 9:42 AM
  Mark Correct
  Correct Answer
  Hi Chris,
  That is a great suggestion and it worked to enclose the fluid (see the picture below for the thin feature) - thank you.
  Now I am applying the boundary conditions, but cannot seem to select the inner faces of the fluid boundary. I have tried to make the contours a 3d sketch and choose that profile to apply the condition to but it didn't let me select the sketch (it has to be a surface as I understand). The sketch is highlighted below. I have also got the same problem with the holes on the planar surface - it doesn't let me select the inner circle surfaces to apply the boundary condition to. Any suggestions?
  Thanks for your time, much appreciated
  Like • Show 0 Likes0
  Actions
  - Chris Michalski @ Euan Long on Jul 15, 2013 9:55 AM
    Mark Correct
    Correct Answer
    when you make that bounding surface it needs to re-create the features of your holes. It looks like you made one continuous solid to close off your fluid volume. If so, you need to use split lines on those surfaces in order to create the small areas on which to define the boundary conditions. This will produce the 3 circles and ellipsoids that define the inlet/outlet geometry.
    Like • Show 1 Like1
    Actions
    - Euan Long @ Chris Michalski on Jul 15, 2013 12:06 PM
      Mark Correct
      Correct Answer
      I'd not heard of split lines before, gave it a go and yes it worked thank you. However I later realised that when making the thin extrude that if I merged the thin feature with the component it'd then allow me to later select the smaller inside surfaces for boundary conditions anyway! I'm not sure why I didn't do this in the first place from your advice. Now I have a working model, many thanks for your advice Chris!
      Euan
      Like • Show 0 Likes0
      Actions

Problems adding lids

Attachments

Outcomes

Related Content

Recommended Content