precice · MakisH · May 10, 2026 · May 10, 2026
diff --git a/changelog-entries/770 .md b/changelog-entries/770 .md
@@ -0,0 +1 @@
+- Reduced the simulated time and output frequency of the heat-exchanger-simplified tutorial (from 5s to 1s, and from once to every coupling time window to one every 10) [#770](https://github.com/precice/tutorials/pull/770)
diff --git a/heat-exchanger-simplified/README.md b/heat-exchanger-simplified/README.md
@@ -61,7 +61,11 @@ to run the solid participant (which is also controlling the coupling).
 
 Similarly to the [flow over heated plate: Two meshes](https://precice.org/tutorials-flow-over-heated-plate-two-meshes.html) tutorial.
 
-![Results of the simplified heat exchanger tutorial](images/tutorials-heat-exchanger-simplified-overview.png)
+![Results of the simplified heat exchanger tutorial at t=1s](images/tutorials-heat-exchanger-simplified-overview-1s.png)
+
+By default, this tutorial simulates 1s. Temperature distribution at 5s:
+
+![Results of the simplified heat exchanger tutorial at t=5s](images/tutorials-heat-exchanger-simplified-overview-5s.png)
 
 ![Animation of the simplified heat exchanger tutorial](images/tutorials-heat-exchanger-simplified-animation.webp)
 

diff --git a/heat-exchanger-simplified/fluid-bottom-openfoam/system/controlDict b/heat-exchanger-simplified/fluid-bottom-openfoam/system/controlDict
@@ -14,13 +14,13 @@ startTime       0;
 
 stopAt          endTime;
 
-endTime         5;
+endTime         1;
 
 deltaT          0.01;
 
 writeControl    runTime;
 
-writeInterval   0.01;
+writeInterval   0.1;
 
 purgeWrite      0;
 

diff --git a/heat-exchanger-simplified/fluid-top-openfoam/system/controlDict b/heat-exchanger-simplified/fluid-top-openfoam/system/controlDict
@@ -14,13 +14,13 @@ startTime       0;
 
 stopAt          endTime;
 
-endTime         5;
+endTime         1;
 
 deltaT          0.01;
 
 writeControl    runTime;
 
-writeInterval   0.01;
+writeInterval   0.1;
 
 purgeWrite      0;
 

diff --git a/...exchanger-simplified/images/tutorials-heat-exchanger-simplified-overview-1s.png b/...exchanger-simplified/images/tutorials-heat-exchanger-simplified-overview-1s.png
diff --git a/...ls-heat-exchanger-simplified-overview.png → ...heat-exchanger-simplified-overview-5s.png b/...ls-heat-exchanger-simplified-overview.png → ...heat-exchanger-simplified-overview-5s.png
diff --git a/heat-exchanger-simplified/precice-config.xml b/heat-exchanger-simplified/precice-config.xml
@@ -92,7 +92,7 @@
 
   <coupling-scheme:multi>
     <time-window-size value="0.01" />
-    <max-time value="5" />
+    <max-time value="1" />
     <max-iterations value="30" />
     <participant name="Fluid-Top" />
     <participant name="Fluid-Bottom" />

diff --git a/heat-exchanger-simplified/solid-calculix/solid.inp b/heat-exchanger-simplified/solid-calculix/solid.inp
@@ -54,7 +54,7 @@ Nall,305.0
 ** written by write_step_begin function
 *STEP, INC=2000
 *HEAT TRANSFER, DIRECT
-0.01,5.0
+0.01,1.0
 
 ***********************************************************
 ** Fixed temperature constraint applied
@@ -71,7 +71,7 @@ Nyend,11,11,0.0
 ***********************************************************
 ** Outputs --> frd file
 ** written by write_outputs_types function
-*NODE FILE
+*NODE FILE, FREQUENCY=10
 NT
 
 ***********************************************************
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		- Reduced the simulated time and output frequency of the heat-exchanger-simplified tutorial (from 5s to 1s, and from once to every coupling time window to one every 10) [#770](https://github.com/precice/tutorials/pull/770)