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PGAPHT |
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PGAPHT |
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»Click here to display Table of Contents«
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PGAPHT |
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PGAPHT |
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Bulk Data Entry
PGAPHT – Gap Element Heat Transfer Conduction Properties for Heat Transfer Analysis
Description
Defines heat transfer conduction properties of the gap (CGAP or CGAPG) elements for heat transfer analysis.
Format
(1) |
(2) |
(3) |
(4) |
(5) |
(6) |
(7) |
(8) |
(9) |
(10) |
PGAPHT |
PID |
KAHT |
KBHT |
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TCID |
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Contact with automatic determination of KAHT:
Minimum data required to request clearance based contact conduction (see comments 2 and 3):
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Field |
Contents |
PID |
Property identification number. No default (Integer > 0) |
KAHT |
Conductance for the closed gap. See comment 2. No default (Real > 0.0 or AUTO) |
KBHT |
Conductance for the open gap. See comment 2. Default = 10-14 * KAHT (Real > 0.0) This default is also set when KBHT=0. |
TCID |
Identification number of a TABLED# entry. This table specifies gap conductance based on gap clearance. See comments 2, 3, and 4. Default = 0 (Integer > 0) |
| 1. | PGAPHT provides heat transfer conductivity for CGAP/CGAPG element. PGAPHT must match PID with an existing PGAP. |
| 2. | KAHT and KBHT represent gap conductance values for closed and open gaps. Theoretically, while higher conductance values enforce a perfect conductor, excessively high values may cause poor conditioning of the conductivity matrix. If such conditions are observed, it may be beneficial to reduce the value of gap conductance, or use clearance and pressure based conductance. |
To facilitate reasonable values of KAHT, automatic calculation is supported, specifically:
| • | Option KAHT=AUTO determines the value of KAHT for each gap element using the conductance of surrounding elements. |
| 3. | TCID points to a TABLED# entry that specifies total conductance based on gap clearance. For coupled thermal contact analysis where nonlinear static subcase provides contact status for thermal contact, TCID overrides KBHT for open GAP, and KAHT for closed GAP. TCID is ignored for linear CGAP/CGAPG elements. |
| 4. | Thermal-structural analysis problems involving contact are fully coupled since contact/gap status changes thermal conductivity. Refer to Contact-based Thermal Analysis in the User’s Guide for more information. |
| 5. | A clearance-based conductance table should start from zero conductance. Conductance is linearly interpolated for values within the tabular range, and is extrapolated to zero outside the range. |
| 6. | This card is represented as a property in HyperMesh. |
See Also:
