Looking up nodes

Cheeraxe1999

I have a 25905 node problem that won't compute due to a conflict on one node. is there a way to look up that specific node to resolve the issue, or do i have to click nodes until i find it?

Sergio

Go to Menu/Edit/Select node by number...

Regards

Cheeraxe1999

I've tried that. It doesn't select a node. I type in the node number, click okay, and nothing happens.

Cheeraxe1999

It's node 8882. I'm sure there are more after this one.

Sergio

Hide the element surfaces and edges, then select node by number and you will see it in blue.

Cheeraxe1999

Well this is nice. How does one go about fixing something like this, now that I can isolate the problem?

Victor

Look for multiple constraints sharing that node and see if they're either physically conflicting or breaking Mecway's rules. Thermal constraints include fixed temperature (one node cannot have two different temperatures at the same time) and bonded contact (complicated restrictions, see manual).

I think that node belongs to the slave of one bonded contact (Pipe_to_FG) and either surface of another (Pipe_to_Sheath_and_Interior_Air), which is not allowed. You can correct it by swapping the master and slave for the first one so that the common nodes are only on master surfaces, which is allowed.

Cheeraxe1999

I will most definitely look into that. Thank you for explaining.

Cheeraxe1999

That worked very well. Thank you!

Cheeraxe1999

So, I've encountered another problem like the one described earlier, but can't figure out was the conflict is. The node is on the surface "Pipe Exterior Master" which has all 11 TraceX_to_Steel_Pipe as slaves. The node appears to be in between the areas touching the traces, so I don't think its an issue with bonded contact. There is a convection value and radiation value for this surface, however. The solver fails on node 7179.

Cheeraxe1999

It's a conflict between the pipe and the aluminum tape surface. Not sure which should be master - I switched them and then got another error on the face of the tape.

Victor

Node 7179 is part of the the very first bonded contact's slave surface Pipe_to_Tape as well as Pipe_Exterior_Master. So that's why it fails. An intersection between 3 parts all having bonded contacts on their common edge is limitation that you can't escape by swapping master and slave. You may have to change the geometry or exclude the common edge faces from the bonded contacts.

The TraceX parts must all be slaves like you have them because they have a much finer mesh than what they're connected to.

Another approach is to use the CCX solver and replace any problematic bonded contacts with thermal contact conductance.