I am having a problem when trying to run a simulation with a hot-runner put on the mould surface.
Geometry was imported, meshed and the inj. location was set. Finally, a property was assigned to the part, as to be the hot-runner.
The problem came when simulation crashed after a few seconds:
WARNING 304690 ** No path for flow from injection to element
WARNING 304700 ** Altogether xxxxxx part elements with no flow path to injection were found
ERROR 304710 ** Some of the part cannot be reached by polymer flow.
Wasn`t sure how to resolve this problem, just ran "Surface connectivity" analysis but did not help.
Can someone please help me to solve this problem.
I attached an image of the corresponding part of the mould.
I`m grateful for your help in advance.
probably a mesh issue .. see if you have "TWO" nodes at injection point ...
Clean the mesh off of the interface surface .... delete the nodes (clean) and manually remesh connecting to the hot drop tip node.
I'm thinkin along the same lines as Mike: make sure that you injecting on a node that is associated with the hotrunner. If two nodes are on top of eachother somehow (like Mike suggested) the injection point may be associated with the wrong node.
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So, what was the result of the connectivity analysis? Most probably the injection node of the molding is not the same as the end node in the gate or two segments in the runner system are disconnected. Find the problem and merge the nodes.
Or if you a lazy run a global merge tool that would merge all nodes closely located to each other (just be concious not to make the tolerance to high so not to merge nodes in the mesh that should be different.
thank you very much for all the valuable replies and sorry for not responding earlier.
I tried to follow the procedures you suggested, but unfortunately i`m still having this problem.
I could not really manage to "clean up" that area - and then to remesh it manually - so I simply moved the tip of the runner as close as possible to the surface of the piece and tried to merge the nodes, but still have the problem, no polymer flow.
When I reached the least distance between the runner and piece i applied global merge, which eventually merged the whole system (was not good...)
Because of the quite long distance between the tip and piece surface, I needed to set a high enough tolerance otherwise it would not have been merged.
May I kindly ask you to spare some of your time to write me a short "step-by-step to do" , so maybe would be easier for to follow up.
I attached a closer image of the concerned area.
I`m grateful in advance for all the replies and sorry for drip feeding questions...
thanks again and have nice day,
It looks to me like your "gate" mesh is not connected to your part mesh .. from the pic you sent
The short "green" mesh between the hot runner and the part needs to be constructed as "part" volume.
This is easy to fix but hard to explain ........
Easiest way to get this to run is to eliminate the short green area and have the hot tip gate connect directly to a node on the part.
yes, agree on that.
Need to create the geometry missing between cavity and runner/gate:
- If you really not need runners to be modeled as 3D tetra, you can delete the runner/gate tetra elements and create lines from cavity and assign the runner properties and mesh to beam elements or
- in cad: make sure you have runner/gate and cavity geometrically connected before exporting to Moldflow.
Create lines/curves from: Geometry > Curves
My first thought when I read your post is that you have 'hot runner' properties assigned to tetras somewhere after where you have either 'cold runner' properties or 'part geometry' properties. (this cannot be achieved obviously)
What I would do is: select by properties my entire model in order to separate in different layers the trias or tetras assigned with 'hot runner' properties; and do the same with the part tetras and cold runner tetras.
I'm pretty sure you will find a couple of tetras along the part or cold runner asigned as 'hot runner' tetras.
hopefully this will solve your problem and let you sleep at night,