# 2D-model with 1D-thermal network **URL:** \ **Category:** Examples/Tutorials\ **Created:** [April 15, 2025, 8:43am UTC](https://calculix.discourse.group/t/2d-model-with-1d-thermal-network/2684 "2025-04-15T08:43:36Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![rafal.brzegowy](https://avatars.discourse-cdn.com/v4/letter/r/a9adbd/32.png) [@rafal.brzegowy](https://calculix.discourse.group/u/rafal.brzegowy)\ **Post date:** [April 15, 2025, 8:43am UTC](https://calculix.discourse.group/t/2d-model-with-1d-thermal-network/2684/1 "2025-04-15T08:43:36Z")
Does anyone have an example (even the simplest one) of such a connection, such an analysis as the example below? ![fw05_2D_thermal](https://global.discourse-cdn.com/free1/uploads/calculix/original/2X/b/b2409fbbfe71d22d493650281a58dee39fe9b114.gif) Source: > **[CALCULIX: A Three-Dimensional Structural Finite Element Program](https://www.calculix.de/fw05.html)** ---
**Author:** ![Disla](https://yyz2.discourse-cdn.com/free1/user_avatar/calculix.discourse.group/disla/32/3548_2.png) [@Disla](https://calculix.discourse.group/u/Disla)\ **Post date:** [April 15, 2025, 10:53am UTC](https://calculix.discourse.group/t/2d-model-with-1d-thermal-network/2684/2 "2025-04-15T10:53:10Z")
Hi Rafal, There was a post some time ago about this kind of simulations .Mecway has nicely implement it for Shell and Solid Elements. Let me know if you need something else. > [@Flow Network model - missing some heat](https://calculix.discourse.group/t/flow-network-model-missing-some-heat/1360): > > I have a test problem that uses heat transfer with a pipe flow network. There is no pressure drop calculation, only mass flow and capacitance are considered (test model below). The figure shows the issue. I apply a convection on the base, a mass flow and inlet temperature to the pipe. I expected the convection, conduction and thermal mass transport to all be the same, but the pipe flow “cool down” is about 30% too low. Any help would be appreciated! ---------------- pipetest.inp \*NO… ---
**Author:** ![Disla](https://yyz2.discourse-cdn.com/free1/user_avatar/calculix.discourse.group/disla/32/3548_2.png) [@Disla](https://calculix.discourse.group/u/Disla)\ **Post date:** [April 16, 2025, 10:05pm UTC](https://calculix.discourse.group/t/2d-model-with-1d-thermal-network/2684/3 "2025-04-16T22:05:27Z")
Example Validated. CAX4 elements used. > **[Face numbering for Shell elements and CAX elements](https://mecway.com/forum/discussion/1625/face-numbering-for-shell-elements-and-cax-elements)** > > Hi Victor, I’m finding an unexpected result, and I think I found the source of the discrepancy. ---
**Author:** ![klaus.wittig](https://avatars.discourse-cdn.com/v4/letter/k/4da419/32.png) [@klaus.wittig](https://calculix.discourse.group/u/klaus.wittig)\ **Post date:** [April 22, 2025, 6:59pm UTC](https://calculix.discourse.group/t/2d-model-with-1d-thermal-network/2684/4 "2025-04-22T18:59:02Z")
Hi Rafal, you find the model some lines above the source of your picture on [www.calculix.de](http://www.calculix.de). Or do you ask for a second model? ---
**Author:** ![Disla](https://yyz2.discourse-cdn.com/free1/user_avatar/calculix.discourse.group/disla/32/3548_2.png) [@Disla](https://calculix.discourse.group/u/Disla)\ **Post date:** [April 25, 2025, 9:12am UTC](https://calculix.discourse.group/t/2d-model-with-1d-thermal-network/2684/5 "2025-04-25T09:12:48Z")
Hi, When using a counterflow mass flowrate (- value of mass flow), MAFLOW\_MF gives un-consistent alternating results (+/-/+/-/+…) on the nodes of the network element. That do not happen when flow goes in the positive direction. Temperatures are right. Regards ![imagen](https://global.discourse-cdn.com/free1/uploads/calculix/original/2X/7/7f75dccd872bf5958d4a3217ac5a2f4ea3324064.png) ```auto ** Generated by Mecway 28 *NODE 1,0,0.1,-1.224606353822E-17 2,0,0.09,-9.796850830579E-18 3,0,0.08,-7.347638122934E-18 4,0,0.07,-4.89842541529E-18 5,0,0.06,-2.449212707645E-18 6,0,0.05,0 7,0,0.04,1.224606353822E-18 8,0,0.03,2.449212707645E-18 9,0,0.02,3.673819061467E-18 10,0,0.01,4.89842541529E-18 11,0,0,6.123031769112E-18 12,0.08,0,0 13,0.08,0.01,0 14,0.08,0.02,0 15,0.08,0.03,0 16,0.08,0.04,0 17,0.08,0.05,0 18,0.08,0.06,0 19,0.08,0.07,0 20,0.08,0.08,0 21,0.08,0.09,0 22,0.08,0.1,0 23,0.015,0.09,-9.796850830579E-18 24,0.015,0.08,-7.347638122934E-18 25,0.015,0.07,-4.89842541529E-18 26,0.015,0.06,-2.449212707645E-18 27,0.015,0.05,-4.622231866529E-33 28,0.015,0.04,2.449212707645E-18 29,0.015,0.03,3.673819061467E-18 30,0.015,0.02,4.89842541529E-18 31,0.015,0.01,6.123031769112E-18 32,0.015,8.673617379884E-18,7.347638122934E-18 33,0.015,-0.01,8.572244476757E-18 34,0.01833333333333,0.07,-4.89842541529E-18 35,0.02166666666667,0.07,-4.89842541529E-18 36,0.025,0.07,-4.89842541529E-18 37,0.02833333333333,0.07,-4.89842541529E-18 38,0.03166666666667,0.07,-4.89842541529E-18 39,0.035,0.07,-4.89842541529E-18 40,0.01833333333333,0.05,-4.622231866529E-33 41,0.02166666666667,0.05,-4.622231866529E-33 42,0.025,0.05,-4.622231866529E-33 43,0.02833333333333,0.05,-4.622231866529E-33 44,0.03166666666667,0.05,-4.622231866529E-33 45,0.035,0.05,-4.622231866529E-33 46,0.01833333333333,0.03,3.673819061467E-18 47,0.02166666666667,0.03,3.673819061467E-18 48,0.025,0.03,3.673819061467E-18 49,0.02833333333333,0.03,3.673819061467E-18 50,0.03166666666667,0.03,3.673819061467E-18 51,0.035,0.03,3.673819061467E-18 52,0.01833333333333,0.01,6.123031769112E-18 53,0.02166666666667,0.01,6.123031769112E-18 54,0.025,0.01,6.123031769112E-18 55,0.02833333333333,0.01,6.123031769112E-18 56,0.03166666666667,0.01,6.123031769112E-18 57,0.035,0.01,6.123031769112E-18 58,0.01833333333333,-0.01,8.572244476757E-18 59,0.02166666666667,-0.01,8.572244476757E-18 60,0.025,-0.01,8.572244476757E-18 61,0.02833333333333,-0.01,8.572244476757E-18 62,0.03166666666667,-0.01,8.572244476757E-18 63,0.035,-0.01,8.572244476757E-18 64,0.01833333333333,0.09,-9.796850830579E-18 65,0.02166666666667,0.09,-9.796850830579E-18 66,0.025,0.09,-9.796850830579E-18 67,0.02833333333333,0.09,-9.796850830579E-18 68,0.03166666666667,0.09,-9.796850830579E-18 69,0.035,0.09,-9.796850830579E-18 70,0.02166666666667,0.06,-2.449212707645E-18 71,0.02833333333333,0.06,-2.449212707645E-18 72,0.035,0.06,-2.449212707645E-18 73,0.02166666666667,0.04,2.449212707645E-18 74,0.02833333333333,0.04,2.449212707645E-18 75,0.035,0.04,2.449212707645E-18 76,0.02166666666667,0.02,4.89842541529E-18 77,0.02833333333333,0.02,4.89842541529E-18 78,0.035,0.02,4.89842541529E-18 79,0.02166666666667,8.673617379884E-18,7.347638122934E-18 80,0.02833333333333,8.673617379884E-18,7.347638122934E-18 81,0.035,8.673617379884E-18,7.347638122934E-18 82,0.02166666666667,0.08,-7.347638122934E-18 83,0.02833333333333,0.08,-7.347638122934E-18 84,0.035,0.08,-7.347638122934E-18 85,0.065,0.11,-1.836909530734E-17 86,0.065,0.1,-1.591988259969E-17 87,0.065,0.09,-1.347066989205E-17 88,0.065,0.08,-1.10214571844E-17 89,0.065,0.07,-8.572244476757E-18 90,0.065,0.06,-6.123031769112E-18 91,0.065,0.05,-4.89842541529E-18 92,0.065,0.04,-3.673819061467E-18 93,0.065,0.03,-2.449212707645E-18 94,0.065,0.02,-1.224606353822E-18 95,0.065,0.01,-9.437056727497E-33 96,0.06166666666667,0.09,-1.347066989205E-17 97,0.05833333333333,0.09,-1.347066989205E-17 98,0.055,0.09,-1.347066989205E-17 99,0.05166666666667,0.09,-1.347066989205E-17 100,0.04833333333333,0.09,-1.347066989205E-17 101,0.045,0.09,-1.347066989205E-17 102,0.06166666666667,0.07,-8.572244476757E-18 103,0.05833333333333,0.07,-8.572244476757E-18 104,0.055,0.07,-8.572244476757E-18 105,0.05166666666667,0.07,-8.572244476757E-18 106,0.04833333333333,0.07,-8.572244476757E-18 107,0.045,0.07,-8.572244476757E-18 108,0.06166666666667,0.05,-4.89842541529E-18 109,0.05833333333333,0.05,-4.89842541529E-18 110,0.055,0.05,-4.89842541529E-18 111,0.05166666666667,0.05,-4.89842541529E-18 112,0.04833333333333,0.05,-4.89842541529E-18 113,0.045,0.05,-4.89842541529E-18 114,0.06166666666667,0.03,-2.449212707645E-18 115,0.05833333333333,0.03,-2.449212707645E-18 116,0.055,0.03,-2.449212707645E-18 117,0.05166666666667,0.03,-2.449212707645E-18 118,0.04833333333333,0.03,-2.449212707645E-18 119,0.045,0.03,-2.449212707645E-18 120,0.06166666666667,0.01,-9.437056727497E-33 121,0.05833333333333,0.01,-9.437056727497E-33 122,0.055,0.01,-9.437056727497E-33 123,0.05166666666667,0.01,-9.437056727497E-33 124,0.04833333333333,0.01,-9.437056727497E-33 125,0.045,0.01,-9.437056727497E-33 126,0.06166666666667,0.11,-1.836909530734E-17 127,0.05833333333333,0.11,-1.836909530734E-17 128,0.055,0.11,-1.836909530734E-17 129,0.05166666666667,0.11,-1.836909530734E-17 130,0.04833333333333,0.11,-1.836909530734E-17 131,0.045,0.11,-1.836909530734E-17 132,0.05833333333333,0.08,-1.10214571844E-17 133,0.05166666666667,0.08,-1.10214571844E-17 134,0.045,0.08,-1.10214571844E-17 135,0.05833333333333,0.06,-6.123031769112E-18 136,0.05166666666667,0.06,-6.123031769112E-18 137,0.045,0.06,-6.123031769112E-18 138,0.05833333333333,0.04,-3.673819061467E-18 139,0.05166666666667,0.04,-3.673819061467E-18 140,0.045,0.04,-3.673819061467E-18 141,0.05833333333333,0.02,-1.224606353822E-18 142,0.05166666666667,0.02,-1.224606353822E-18 143,0.045,0.02,-1.224606353822E-18 144,0.05833333333333,0.1,-1.591988259969E-17 145,0.05166666666667,0.1,-1.591988259969E-17 146,0.045,0.1,-1.591988259969E-17 147,0.015,0.11,-1.469527624587E-17 148,0.015,0.1,-1.224606353822E-17 149,0.04833333333333,-0.01,2.449212707645E-18 150,0.045,-0.01,2.449212707645E-18 151,0.05833333333333,1.040834085586E-17,1.224606353822E-18 152,0.05166666666667,1.040834085586E-17,1.224606353822E-18 153,0.045,1.040834085586E-17,1.224606353822E-18 154,0.06166666666667,-0.01,2.449212707645E-18 155,0.05833333333333,-0.01,2.449212707645E-18 156,0.01833333333333,0.11,-1.469527624587E-17 157,0.02166666666667,0.11,-1.469527624587E-17 158,0.025,0.11,-1.469527624587E-17 159,0.02833333333333,0.11,-1.469527624587E-17 160,0.03166666666667,0.11,-1.469527624587E-17 161,0.035,0.11,-1.469527624587E-17 162,0.02166666666667,0.1,-1.224606353822E-17 163,0.02833333333333,0.1,-1.224606353822E-17 164,0.035,0.1,-1.224606353822E-17 165,0.055,-0.01,2.449212707645E-18 166,0.065,1.040834085586E-17,1.224606353822E-18 167,0.065,-0.01,2.449212707645E-18 168,0.05166666666667,-0.01,2.449212707645E-18 *ELEMENT,TYPE=D 1,1,2,3 2,3,4,5 3,5,6,7 4,7,8,9 5,9,10,11 6,12,13,14 7,14,15,16 8,16,17,18 9,18,19,20 10,20,21,22 *ELEMENT,TYPE=S8 11,59,53,55,61,79,54,80,60 12,61,55,57,63,80,56,81,62 13,25,23,65,35,24,64,82,34 14,35,65,67,37,82,66,83,36 15,37,67,69,39,83,68,84,38 16,27,25,35,41,26,34,70,40 17,41,35,37,43,70,36,71,42 18,43,37,39,45,71,38,72,44 19,29,27,41,47,28,40,73,46 20,47,41,43,49,73,42,74,48 21,49,43,45,51,74,44,75,50 22,31,29,47,53,30,46,76,52 23,53,47,49,55,76,48,77,54 24,55,49,51,57,77,50,78,56 25,33,31,53,59,32,52,79,58 26,115,121,123,117,141,122,142,116 27,117,123,125,119,142,124,143,118 28,85,87,97,127,86,96,144,126 29,127,97,99,129,144,98,145,128 30,129,99,101,131,145,100,146,130 31,87,89,103,97,88,102,132,96 32,97,103,105,99,132,104,133,98 33,99,105,107,101,133,106,134,100 34,89,91,109,103,90,108,135,102 35,103,109,111,105,135,110,136,104 36,105,111,113,107,136,112,137,106 37,91,93,115,109,92,114,138,108 38,109,115,117,111,138,116,139,110 39,111,117,119,113,139,118,140,112 40,93,95,121,115,94,120,141,114 41,23,147,157,65,148,156,162,64 42,65,157,159,67,162,158,163,66 43,67,159,161,69,163,160,164,68 44,121,155,168,123,151,165,152,122 45,123,168,150,125,152,149,153,124 46,95,167,155,121,166,154,151,120 *NSET,NSET=TEMP_WATER_INLET 1 22 *NSET,NSET=WATTER_NODES_1 2 3 4 5 6 7 8 9 10 11 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 147 148 156 157 158 159 160 161 162 163 164 *NSET,NSET=WATTER_NODES_2 12 13 14 15 16 17 18 19 20 21 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 149 150 151 152 153 154 155 165 166 167 168 *NSET,NSET=MASS_NODES_1 2 4 6 8 10 *NSET,NSET=MASS_NODES_2 13 15 17 19 21 *ELSET,ELSET=WATTER_ELEM 1 2 3 4 5 6 7 8 9 10 *ELSET,ELSET=WATER_ELEMENTS_1 1 2 3 4 5 *ELSET,ELSET=WATER_ELEMENTS_2 6 7 8 9 10 *ELSET,ELSET=COMPONENT 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 *SURFACE,NAME=FACES_1 16,S3 19,S3 13,S3 22,S3 25,S3 41,S3 *SURFACE,NAME=FACES_2 31,S3 34,S3 37,S3 40,S3 46,S3 28,S3 *MATERIAL,NAME=WATTER_PRODUCT *DENSITY 1000 *CONDUCTIVITY,TYPE=ISO 10000,0 *SPECIFIC HEAT 4178 *FLUID CONSTANTS 4178,0,0 *MATERIAL,NAME=SHELLS *DENSITY 100 *CONDUCTIVITY,TYPE=ISO 0.001,0 *SPECIFIC HEAT 1 *FLUID CONSTANTS 1,0,0 *FLUID SECTION,ELSET=WATTER_ELEM,MATERIAL=WATTER_PRODUCT *SHELL SECTION,ELSET=COMPONENT,MATERIAL=SHELLS 2 *AMPLITUDE,NAME=A_1 0,373.15 1,473.15 100,473.15 *INITIAL CONDITIONS,TYPE=TEMPERATURE WATTER_NODES_1,373.15 WATTER_NODES_2,373.15 *STEP,INC=100000,AMPLITUDE=STEP *HEAT TRANSFER 0.001,100,0,0.2 *BOUNDARY MASS_NODES_1,1,,0.001 MASS_NODES_2,1,,-0.001 *BOUNDARY,AMPLITUDE=A_1 TEMP_WATER_INLET,11,,1 *CFLUX 57,11,-1333.333333333 81,11,-2666.666666667 63,11,-666.6666666667 69,11,-1333.333333333 84,11,-2666.666666667 39,11,-1333.333333333 72,11,-2666.666666667 45,11,-1333.333333333 75,11,-2666.666666667 51,11,-1333.333333333 78,11,-2666.666666667 125,11,-1333.333333333 143,11,-2666.666666667 119,11,-1333.333333333 101,11,-1333.333333333 146,11,-2666.666666667 131,11,-666.6666666667 107,11,-1333.333333333 134,11,-2666.666666667 113,11,-1333.333333333 137,11,-2666.666666667 140,11,-2666.666666667 161,11,-666.6666666667 164,11,-2666.666666667 150,11,-666.6666666667 153,11,-2666.666666667 *FILM 16,F3FC,5,100000 19,F3FC,7,100000 13,F3FC,3,100000 22,F3FC,9,100000 25,F3FC,11,100000 41,F3FC,1,100000 *FILM 31,F3FC,20,100000 34,F3FC,18,100000 37,F3FC,16,100000 40,F3FC,14,100000 46,F3FC,12,100000 28,F3FC,22,100000 *NODE FILE,GLOBAL=YES NT *EL FILE HFL *BOUNDARY **,Amplitude=A_2 Mass_Nodes_1,1,,1E-3 Mass_Nodes_2,1,,-1E-3 *NODE FILE MF *END STEP ``` ---
**Author:** ![rafal.brzegowy](https://avatars.discourse-cdn.com/v4/letter/r/a9adbd/32.png) [@rafal.brzegowy](https://calculix.discourse.group/u/rafal.brzegowy)\ **Post date:** [April 28, 2025, 5:55am UTC](https://calculix.discourse.group/t/2d-model-with-1d-thermal-network/2684/6 "2025-04-28T05:55:27Z")
The example is already working for me, my archive program did not unpack all the contents the first time, which misled me. ---
**Author:** ![JohnM](https://avatars.discourse-cdn.com/v4/letter/j/848f3c/32.png) [@JohnM](https://calculix.discourse.group/u/JohnM)\ **Post date:** [August 21, 2026, 6:20pm UTC](https://calculix.discourse.group/t/2d-model-with-1d-thermal-network/2684/7 "2026-08-21T18:20:47Z")
[![](https://global.discourse-cdn.com/free1/uploads/calculix/original/2X/2/2e7860f60748c09c5e4b7a0c6061b8c713ad6b1d.jpeg "Mecway simple heat exchanger") ](https://www.youtube.com/watch?v=eLaaVRKIaaY&t=4s) sorry I’m a year late! model is available in the comments