Salome "Merge Nodes" feature
16 years 4 months ago #2170
by JMB
Salome "Merge Nodes" feature was created by JMB
Hello,
I am trying to use the Merge Nodes dialog and found little or no help from the Help text. Can somebody elaborate how one is supposed to use this window please?
After clicking on the "Detect" button, several nodes are displayed ( "7, 17484, 17485, 17486, 17487, 17488, 17489, 17490" ) in the "Coincident Nodes" sub-panel. The questions I have are:
"Co-Incident nodes" Sub-Panel:
1. Does this mean that nodes "7, 17484, 17485, 17486, 17487, 17488, 17489, 17490" all happen to be co-incident? Or are they each coincident with some other node that is not shown?
2. Do I delete all nodes except node "7"?
3. Do I delete all nodes including "7"?
4. What do the "Add" and "Remove" buttons do?
"Edit Group" Sub-panel:
4. What does the "Select All" check box do?
5. What is the purpose of the "Edit Selected group" of this sub-panel.
6. What do the "X" and "+" buttons beside this sub-panel do?
7. What is the function of the "|<<" button of this sub-panel?
Some detailed explanations would help me immensely and perhaps other users too. Thank you.
Regards,
JMB
I am trying to use the Merge Nodes dialog and found little or no help from the Help text. Can somebody elaborate how one is supposed to use this window please?
After clicking on the "Detect" button, several nodes are displayed ( "7, 17484, 17485, 17486, 17487, 17488, 17489, 17490" ) in the "Coincident Nodes" sub-panel. The questions I have are:
"Co-Incident nodes" Sub-Panel:
1. Does this mean that nodes "7, 17484, 17485, 17486, 17487, 17488, 17489, 17490" all happen to be co-incident? Or are they each coincident with some other node that is not shown?
2. Do I delete all nodes except node "7"?
3. Do I delete all nodes including "7"?
4. What do the "Add" and "Remove" buttons do?
"Edit Group" Sub-panel:
4. What does the "Select All" check box do?
5. What is the purpose of the "Edit Selected group" of this sub-panel.
6. What do the "X" and "+" buttons beside this sub-panel do?
7. What is the function of the "|<<" button of this sub-panel?
Some detailed explanations would help me immensely and perhaps other users too. Thank you.
Regards,
JMB
16 years 2 months ago #2291
by kwou
Interest: structural mechanics, solar energy (picture at 'my location' shows too little pv panels)
--
kind regards - kees
Replied by kwou on topic Re:Salome "Merge Nodes" feature
Interest: structural mechanics, solar energy (picture at 'my location' shows too little pv panels)
--
kind regards - kees
16 years 2 months ago #2300
by kwou
Interest: structural mechanics, solar energy (picture at 'my location' shows too little pv panels)
--
kind regards - kees
Replied by kwou on topic Re:Salome "Merge Nodes" feature
hi JMB
Trying to find out how the Merge Node functions, I made a small mesh on a block (1*2*4) with a chamfered edge. After moving node 14 from (x;y;z): (1.0; 0.5; 3.8) --> (1.0; 0.2; 3.8) the distance to node 1: (1.0; 0.0; 3.8) is 0.2. Only the y positions of both nodes are different. See images below.
Then merging nodes 1 and 14 twice, yields two different end situations:
- first one has same boundary is orginal mesh and node 14 removed and corresponding elements.
- seconde situation is as given in the image: node 1 removed and the element at the border of the mesh has been removed.
So there seams to be no real logic how to decide which node will be removed. But then, in case the tolerance is small, it should not matter which node and corresponding elements will be removed since the change in geometry will not be significant.
kind regards - kees
Here the modified node 14 is displayed.
This image shows merged nodes 1 and 14: node 1 removed and the element at the edge removed.
This image shows merged nodes 1 and 14: node 14 removed and the element(s) at the inner side removed. The overall geometry remains the same.<br /><br />Post edited by: Kees Wouters, at: 2008/12/17 13:19
Trying to find out how the Merge Node functions, I made a small mesh on a block (1*2*4) with a chamfered edge. After moving node 14 from (x;y;z): (1.0; 0.5; 3.8) --> (1.0; 0.2; 3.8) the distance to node 1: (1.0; 0.0; 3.8) is 0.2. Only the y positions of both nodes are different. See images below.
Then merging nodes 1 and 14 twice, yields two different end situations:
- first one has same boundary is orginal mesh and node 14 removed and corresponding elements.
- seconde situation is as given in the image: node 1 removed and the element at the border of the mesh has been removed.
So there seams to be no real logic how to decide which node will be removed. But then, in case the tolerance is small, it should not matter which node and corresponding elements will be removed since the change in geometry will not be significant.
kind regards - kees
Interest: structural mechanics, solar energy (picture at 'my location' shows too little pv panels)
--
kind regards - kees
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