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BOUNDARYF.html
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<html><head><link rel="stylesheet" type="text/css" href="style.css"/></head><body> <H2> <BR> *BOUNDARYF </H2> <P> Keyword type: step <P> This option is used to prescribe boundary conditions for 3D-fluids calculations. This includes static temperature, velocity and static pressure. <P> The following degrees of freedom are being used: <P> <UL> <LI>1: velocity in the local x-direction </LI> <LI>2: velocity in the local y-direction </LI> <LI>3: velocity in the local z-direction </LI> <LI>8: static pressure </LI> <LI>11: static temperature </LI> </UL> <P> If no *TRANSFORM card applied to the node at stake, the local directions coincide with the global ones. <P> Optional parameters are AMPLITUDE, TIME DELAY, and USER. Their meaning is the same as for the *BOUNDARY card. <P> The main differences with the *BOUNDARY card are: <P> <UL> <LI>the *BOUNDARYF card can only be used within a step </LI> <LI>for fluids the boundary conditions are applied to element faces and not to nodes. The face labels are exactly the same as for the *SURFACE card. </LI> </UL> <P> In order to apply a fluid boundary condition to a surface the element set label underneath may be replaced by a surface name. In that case the face type label takes the value “S” without any number following. <P> Thus, the cards run like: <P><P> <BR> <P> First line: <UL> <LI>*BOUNDARYF </LI> <LI>Enter any needed parameters and their value. </LI> </UL> <P> Following line: <UL> <LI>Element number or element set label </LI> <LI>Local face label of the element </LI> <LI>First degree of freedom constrained </LI> <LI>Last degree of freedom constrained. This field may be left blank if only one degree of freedom is constrained. </LI> <LI>Actual magnitude of the prescribed displacement (default is zero) </LI> </UL> Repeat this line if needed. For the local face numbering the reader is referred to the *DLOAD card. <P> <PRE>
Example:
*BOUNDARYF
22,S3,2,2,.1
</PRE> <P> assigns to degree of freedom two of local face 3 of element 22 the value 0.1. If no transformation applies this degree of freedom corresponds to the velocity in global y-direction. <P> </body></html>