[Xansys] Calculating heat flow across convective surfaces
NOTE: using NMISC (5,11,17,23) only outputs heat rate for convection surfaces! It doesn’t look like
solid87 has conduction outputs at faces… however it’s possible
From the above link: “calculate the sum heat flow across surfaces where convective boundary condition
is applied. Sometimes the analyst may want to check if ANSYS observes the conservation of energy law.
FSUM doesn't work well for this specific purpose. Summation of reaction forces is good for nodes affixed
with temperature boundary conditions only.”
solid87 element:
ASEL,S, , ,6 Define “coolsurf” by using ASEL.
Using the GUI: Utility Menu>Select>Comp/Assembly>Select Comp/Assembly
CM,coolsurf,AREA
cmsel,s,coolsurf !area component "coolsurf" contains the convective surfaces
CMSEL,Type,Name, Entity – Selects a subset of components and assemblies
Type: Label identifying the type of select. s: select a new set
Name: name of component or assembly whose items are to be
selected. For graphical picking “PICK”
nsla,s,1
NSLA,Type,NKEY – Selects those nodes associated with the selected areas
Type:Label identifying the type of select. s: select a new set
NKEY: specifies whether only interior area nodes are to be selected. 1:
select all nodes (interior to area) associated with the selected areas
esln,s !select related elements
ESLN, Type,EKEY,NodeType –selects those elements attached to the selected nodes
Type:Label identifying the type of select. s: select a new set
EKEY: node set key.
0: select element if any of its nodes are in the selected nodal set (default)
1: select element only if all of its nodes are in the selected nodal set
NodeType: Label identifying type of nodes to consider when selecting
ALL (default) Select elements considering all of their nodes
etable,,NMISC,5
ETABLE,Lab,Item,Comp – fills a table of element values for further processing
Item: Label identifying the item. NMISC (Comp is nsum) Element nonsummable
miscellaneous data value at sequence number snum (shown in the Output Data section
of each applicable element description found in the Element Reference).
From Element Reference:
etable,,NMISC,11
etable,,NMISC,17
etable,,NMISC,23
ssum
SSUM – Calculates and prints the sum of element table items