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Chapter 6: UPF Routines and Functions
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the input arguments hc and tb may be used in one of three ways:
1. they may be simply passed thru.
2. they may be used as a flag(e.g. if hc(2) = -3.0, use
a certain set of logic).
3. they may be completely ignored.
and instead redefined with new logic
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this routine is called during each substep of each load step.
it is called for each equilibrium iteration.
it is called once per element. it is called only during the heat
flow load vector formulation stage, and not during the heat flow
evaluation stage.
the call to get the standard ansys input convection surfaces
is made just before entering this routine, so this information is
available to be modified, if desired.
velocity-dependent film coefficients can be computed by inputting the
velocity as the input film coefficient or bulk temperature or
by inputting the velocity as a function of location in space. this
routine could then compute the effective film coefficient.
input arguments:
variable (typ,siz,intent)
elem
(int,sc,in)
ielc
(int,ar(IELCSZ),in)
time
(dp,sc,in)
nr
(int,sc,in)
-
u
(dp,ar(nr),in)
-
ndat
(int,sc,in)
-
hc
(dp,ar(ndat),inout) -
tb
(dp,ar(ndat),inout) -
description
element number for operation.
array of element type characteristics
time of current substep
number of nodal temperatures
of the element
vector of most recent values of the
temperatures
number of data points per element
for example, for solid70, ndat = 24 = 6*4
where 6 = faces per element
4 = corners per face
film coefficients
(has input values for each corner
of each face)
bulk temperature
(has input values for each corner
of each face)
output arguments:
variable (typ,siz,intent)
description
hc
(dp,ar(ndat),inout) - film coefficients
(defines input values for each corner
of each face)
tb
(dp,ar(ndat),inout) - bulk temperature
(defines input values for each corner
of each face)
6.5.4. Subroutine userfx (Changing Element Face Heat Flux Surface Information)
*deck,userfx
user
subroutine userfx (ielc,elem,time,nr,u, ndat,dat)
c *** primary function: change element face heat flux surface info
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*** copyright(c) 2006 SAS IP, Inc. All rights reserved.
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*** ansys, inc.
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in order to activate this user programmable feature,
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the user must enter the 'usrcal,userfx' command.
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this routine is called during each substep of each load step.
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it is called for each equilibrium iteration.
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it is called once per element. it is called only during the heat
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flow load vector formulation stage, and not during the heat flow
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evaluation stage.
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the call to get the standard ansys input heat flux surfaces
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Programmer's Manual for ANSYS . ANSYS Release 11.0 . 002328 . © SAS IP, Inc. All rights reserved.
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