diff --git a/etc/caseDicts/postProcessing/surfaceFieldValue/triSurfaceAverage b/etc/caseDicts/postProcessing/surfaceFieldValue/triSurfaceAverage
new file mode 100644
index 0000000000..3dc71b0274
--- /dev/null
+++ b/etc/caseDicts/postProcessing/surfaceFieldValue/triSurfaceAverage
@@ -0,0 +1,23 @@
+/*--------------------------------*- C++ -*----------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     | Website:  https://openfoam.org
+    \\  /    A nd           | Version:  dev
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+Description
+    Calculates the average on a specified triangulated surface by interpolating
+    onto the triangles and integrating over the surface area. Triangles need to
+    be small (<= cell size) for an accurate result.
+
+\*---------------------------------------------------------------------------*/
+
+name    <triSurfaceFileName>;
+
+fields  (<fieldNames>);
+
+operation areaAverage;
+
+#includeEtc "caseDicts/postProcessing/surfaceFieldValue/triSurfaceValue.cfg"
+
+// ************************************************************************* //
diff --git a/test/postProcessing/channel/system/controlDict b/test/postProcessing/channel/system/controlDict
index 1ceaa402c9..d0459236e6 100644
--- a/test/postProcessing/channel/system/controlDict
+++ b/test/postProcessing/channel/system/controlDict
@@ -398,6 +398,8 @@ surfaceFieldValueFunctions
 
     #includeFunc faceZoneFlowRate(name=f0)
 
+    #includeFunc triSurfaceAverage(name=mid.obj, p)
+
     #includeFunc triSurfaceVolumetricFlowRate(name=mid.obj)
 
     #includeFunc triSurfaceDifference