https://wiki.freecad.org/index.php?title=FEM_EquationHeat&feed=atom&action=history
FEM EquationHeat - Revision history
2024-03-29T01:20:48Z
Revision history for this page on the wiki
MediaWiki 1.40.1
https://wiki.freecad.org/index.php?title=FEM_EquationHeat&diff=1329238&oldid=prev
NewJoker at 14:08, 22 November 2023
2023-11-22T14:08:01Z
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<td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Except for calculations in 2D, for all the above analysis features it is important that they act on a face or a body. <del style="font-weight: bold; text-decoration: none;">Constraints</del> in 3D set to lines or vertices are not recognized by the Elmer solver.</div></td>
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<td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Except for calculations in 2D, for all the above analysis features it is important that they act on a face or a body. <ins style="font-weight: bold; text-decoration: none;">Features</ins> in 3D set to lines or vertices are not recognized by the Elmer solver.</div></td>
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NewJoker
https://wiki.freecad.org/index.php?title=FEM_EquationHeat&diff=1322717&oldid=prev
NewJoker at 00:16, 14 November 2023
2023-11-14T00:16:14Z
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* {{PropertyData|Phase Change Model}}: The model use for phase changes (ice to water etc.). The model '' Spatial 1'' is the apparent-heat-capacity method, ''Spatial 2'' and ''Temporal'' are effective-heat-capacity methods.</br>For more info about the models, see [https://blog.rwth-aachen.de/gfd/files/2017/07/BT_2013_Schueller_elmer_icemole.pdf this paper] (section 2.5.2.2) (is in German). In the paper it was also shown that ''Spatial 1'' has numerical problems on larger temperature gradients and that ''Spatial 2'' was preferred for the phase change ice to water.</div></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* {{PropertyData|Phase Change Model}}: The model use for phase changes (ice to water etc.). The model '' Spatial 1'' is the apparent-heat-capacity method, ''Spatial 2'' and ''Temporal'' are effective-heat-capacity methods.</br>For more info about the models, see [https://blog.rwth-aachen.de/gfd/files/2017/07/BT_2013_Schueller_elmer_icemole.pdf this paper] (section 2.5.2.2) (is in German). In the paper it was also shown that ''Spatial 1'' has numerical problems on larger temperature gradients and that ''Spatial 2'' was preferred for the phase change ice to water.</div></td>
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<td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>==<ins style="font-weight: bold; text-decoration: none;">Analysis Feature</ins> Information== <!--T:17--></div></td>
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<td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The <del style="font-weight: bold; text-decoration: none;">elasticity</del> equation takes the following <del style="font-weight: bold; text-decoration: none;">constraints</del> into account if they are set:</div></td>
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<td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The <ins style="font-weight: bold; text-decoration: none;">heat</ins> equation takes the following <ins style="font-weight: bold; text-decoration: none;">analysis features</ins> into account if they are set:</div></td>
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<td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* [[Image:FEM_ConstraintBodyHeatSource.svg|32px]] [[FEM_ConstraintBodyHeatSource|<del style="font-weight: bold; text-decoration: none;">Constraint body</del> heat source]]</div></td>
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<td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* [[Image:FEM_ConstraintBodyHeatSource.svg|32px]] [[FEM_ConstraintBodyHeatSource|<ins style="font-weight: bold; text-decoration: none;">Body</ins> heat source]]</div></td>
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<td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* [[Image:FEM_ConstraintInitialTemperature.svg|32px]] [[FEM_ConstraintInitialTemperature|<ins style="font-weight: bold; text-decoration: none;">Initial</ins> temperature<ins style="font-weight: bold; text-decoration: none;"> condition</ins>]]</div></td>
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<td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* [[Image:FEM_ConstraintTemperature.svg|32px]] [[FEM_ConstraintTemperature|<del style="font-weight: bold; text-decoration: none;">Constraint</del> <del style="font-weight: bold; text-decoration: none;">temperature</del>]]</div></td>
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<td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* [[Image:FEM_ConstraintTemperature.svg|32px]] [[FEM_ConstraintTemperature|<ins style="font-weight: bold; text-decoration: none;">Temperature</ins> <ins style="font-weight: bold; text-decoration: none;">boundary condition</ins>]]</div></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><!--T:21--></div></td>
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<td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Except for calculations in 2D, for all above <del style="font-weight: bold; text-decoration: none;">constraints</del> it is important that they act on a face or a body. Constraints <del style="font-weight: bold; text-decoration: none;">for</del> 3D set to lines or vertices are not recognized by the Elmer solver.</div></td>
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<td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Except for calculations in 2D, for all<ins style="font-weight: bold; text-decoration: none;"> the</ins> above <ins style="font-weight: bold; text-decoration: none;">analysis features</ins> it is important that they act on a face or a body. Constraints <ins style="font-weight: bold; text-decoration: none;">in</ins> 3D set to lines or vertices are not recognized by the Elmer solver.</div></td>
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NewJoker
https://wiki.freecad.org/index.php?title=FEM_EquationHeat&diff=1244394&oldid=prev
Uwestoehr: correct version
2023-03-23T15:08:28Z
<p>correct version</p>
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Uwestoehr
https://wiki.freecad.org/index.php?title=FEM_EquationHeat&diff=1202292&oldid=prev
Roy 043 at 09:29, 26 October 2022
2022-10-26T09:29:04Z
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><!--T:15--></div></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The heat equation provides these special settings:</div></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The heat equation provides these special settings:</div></td>
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<td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* {{PropertyData|Bubbles}}: There is also a residual-free-bubbles formulation of the stabilized finite-element method. It is more accurate and does not include any ad hoc terms. However, it may be computationally more expensive. If both {{PropertyData|Bubbles}} and {{PropertyData|[[FEM_SolverElmer_SolverSettings#Base|Stabilize]]}} are ''false'', no stabilization is used and then the results might easily be nonsensical.</br>'''Note''': If<del style="font-weight: bold; text-decoration: none;"> you get</del> during the ''first solver iteration'' this error:</br> ERROR:: IterSolve: Numerical Error: System diverged over maximum tolerance.</br>The {{PropertyData|Bubbles}} method failed. In this case set {{PropertyData|[[FEM_SolverElmer_SolverSettings#Base|Stabilize]]}} to ''true''.</div></td>
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<td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* {{PropertyData|Bubbles}}: There is also a residual-free-bubbles formulation of the stabilized finite-element method. It is more accurate and does not include any ad hoc terms. However, it may be computationally more expensive. If both {{PropertyData|Bubbles}} and {{PropertyData|[[FEM_SolverElmer_SolverSettings#Base|Stabilize]]}} are ''false'', no stabilization is used and then the results might easily be nonsensical.</br>'''Note''': If during the ''first solver iteration''<ins style="font-weight: bold; text-decoration: none;"> you get</ins> this error:</br> ERROR:: IterSolve: Numerical Error: System diverged over maximum tolerance.</br>The {{PropertyData|Bubbles}} method failed. In this case set {{PropertyData|[[FEM_SolverElmer_SolverSettings#Base|Stabilize]]}} to ''true''.</div></td>
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Roy 043
https://wiki.freecad.org/index.php?title=FEM_EquationHeat&diff=1202291&oldid=prev
Roy 043: Undo revision 1202222 by Uwestoehr (talk)Restored extra blank line.
2022-10-26T09:27:50Z
<p>Undo revision 1202222 by <a href="/Special:Contributions/Uwestoehr" title="Special:Contributions/Uwestoehr">Uwestoehr</a> (<a href="/User_talk:Uwestoehr" title="User talk:Uwestoehr">talk</a>)Restored extra blank line.</p>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><!--T:23--></div></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The result is the temperature in Kelvin.</div></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The result is the temperature in Kelvin.</div></td>
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Roy 043
https://wiki.freecad.org/index.php?title=FEM_EquationHeat&diff=1202222&oldid=prev
Uwestoehr at 18:38, 25 October 2022
2022-10-25T18:38:18Z
<p></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 18:38, 25 October 2022</td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><!--T:23--></div></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The result is the temperature in Kelvin.</div></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The result is the temperature in Kelvin.</div></td>
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Uwestoehr
https://wiki.freecad.org/index.php?title=FEM_EquationHeat&diff=1202196&oldid=prev
Uwestoehr: handle 2D case
2022-10-25T16:39:12Z
<p>handle 2D case</p>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><!--T:21--></div></td>
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<td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">For</del> <del style="font-weight: bold; text-decoration: none;">the</del> <del style="font-weight: bold; text-decoration: none;">temperature</del> constraints it is important that they act on a face. Constraints set to lines or vertices are not recognized by the Elmer solver.</div></td>
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<td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Except</ins> <ins style="font-weight: bold; text-decoration: none;">for</ins> <ins style="font-weight: bold; text-decoration: none;">calculations in 2D, for all above</ins> constraints it is important that they act on a face<ins style="font-weight: bold; text-decoration: none;"> or a body</ins>. Constraints<ins style="font-weight: bold; text-decoration: none;"> for 3D</ins> set to lines or vertices are not recognized by the Elmer solver.</div></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br /></td>
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Uwestoehr
https://wiki.freecad.org/index.php?title=FEM_EquationHeat&diff=1201998&oldid=prev
Uwestoehr: add another note
2022-10-24T13:08:18Z
<p>add another note</p>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><!--T:16--></div></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Equation:</div></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Equation:</div></td>
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<td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* {{PropertyData|Convection}}: The type of convection to be used in the heat equation.</div></td>
<td class="diff-marker" data-marker="+"></td>
<td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* {{PropertyData|Convection}}: The type of convection to be used in<ins style="font-weight: bold; text-decoration: none;"> the heat equation.</br>'''Note''': If this is not set to ''None'', {{PropertyData|[[FEM_SolverElmer_SolverSettings#Base|Stabilize]]}} must be to ''true'' otherwise the convection term will not be considered for</ins> the heat equation.</div></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* {{PropertyData|Phase Change Model}}: The model use for phase changes (ice to water etc.). The model '' Spatial 1'' is the apparent-heat-capacity method, ''Spatial 2'' and ''Temporal'' are effective-heat-capacity methods.</br>For more info about the models, see [https://blog.rwth-aachen.de/gfd/files/2017/07/BT_2013_Schueller_elmer_icemole.pdf this paper] (section 2.5.2.2) (is in German). In the paper it was also shown that ''Spatial 1'' has numerical problems on larger temperature gradients and that ''Spatial 2'' was preferred for the phase change ice to water.</div></td>
<td class="diff-marker"></td>
<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* {{PropertyData|Phase Change Model}}: The model use for phase changes (ice to water etc.). The model '' Spatial 1'' is the apparent-heat-capacity method, ''Spatial 2'' and ''Temporal'' are effective-heat-capacity methods.</br>For more info about the models, see [https://blog.rwth-aachen.de/gfd/files/2017/07/BT_2013_Schueller_elmer_icemole.pdf this paper] (section 2.5.2.2) (is in German). In the paper it was also shown that ''Spatial 1'' has numerical problems on larger temperature gradients and that ''Spatial 2'' was preferred for the phase change ice to water.</div></td>
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Uwestoehr
https://wiki.freecad.org/index.php?title=FEM_EquationHeat&diff=1201997&oldid=prev
Uwestoehr: add important note
2022-10-24T12:48:52Z
<p>add important note</p>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The heat equation provides these special settings:</div></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The heat equation provides these special settings:</div></td>
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<td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* {{PropertyData|Bubbles}}: There is also a residual-free-bubbles formulation of the stabilized finite-element method. It is more accurate and does not include any ad hoc terms. However, it may be computationally more expensive. If both {{PropertyData|Bubbles}} and {{PropertyData|[[FEM_SolverElmer_SolverSettings#Base|Stabilize]]}} are ''false'', no stabilization is used and then the results might easily be nonsensical.</div></td>
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Uwestoehr
https://wiki.freecad.org/index.php?title=FEM_EquationHeat&diff=1197232&oldid=prev
David69 at 14:00, 8 October 2022
2022-10-08T14:00:02Z
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 14:00, 8 October 2022</td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The heat equation provides these special settings:</div></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The heat equation provides these special settings:</div></td>
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<td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* {{PropertyData|Bubbles}}: There is also a residual-free-bubbles formulation of the stabilized finite-element method. It is more accurate and does not include any ad hoc terms. However, it may be computationally more expensive. If both {{PropertyData|Bubbles}} and {{PropertyData|<del style="font-weight: bold; text-decoration: none;"> </del>[[FEM_SolverElmer_SolverSettings#Base|Stabilize]]}} are ''false'', no stabilization is used and then the results might easily be nonsensical.</div></td>
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David69