From 2b7c977da5cd3b9a0efa0176c7419c09b40565de Mon Sep 17 00:00:00 2001
From: Will Bainbridge <http://cfd.direct>
Date: Tue, 12 Sep 2023 10:23:23 +0100
Subject: [PATCH] solvers::functions: Apply maxDeltaT from functions

The functions module now applies time-step restrictions from the
functions that are running, rather than from the sub-solver. The
sub-solver only exists to be constructed so that its data is available
to the functions. It should not affect the solution process in any way.
---
 applications/modules/functions/functions.C                  | 2 +-
 .../fvModelFunctionObject/fvModelFunctionObject.C           | 6 ++++++
 .../fvModelFunctionObject/fvModelFunctionObject.H           | 3 +++
 3 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/applications/modules/functions/functions.C b/applications/modules/functions/functions.C
index 8fa1244653..e9476559f6 100644
--- a/applications/modules/functions/functions.C
+++ b/applications/modules/functions/functions.C
@@ -100,7 +100,7 @@ Foam::solvers::functions::~functions()
 
 Foam::scalar Foam::solvers::functions::maxDeltaT() const
 {
-    return solverPtr->maxDeltaT();
+    return vGreat;
 }
 
 
diff --git a/src/finiteVolume/functionObjects/fvModelFunctionObject/fvModelFunctionObject.C b/src/finiteVolume/functionObjects/fvModelFunctionObject/fvModelFunctionObject.C
index 07398e3f67..42adc12cd9 100644
--- a/src/finiteVolume/functionObjects/fvModelFunctionObject/fvModelFunctionObject.C
+++ b/src/finiteVolume/functionObjects/fvModelFunctionObject/fvModelFunctionObject.C
@@ -78,4 +78,10 @@ bool Foam::functionObjects::fvModel::write()
 }
 
 
+Foam::scalar Foam::functionObjects::fvModel::maxDeltaT() const
+{
+    return fvModelPtr_().maxDeltaT();
+}
+
+
 // ************************************************************************* //
diff --git a/src/finiteVolume/functionObjects/fvModelFunctionObject/fvModelFunctionObject.H b/src/finiteVolume/functionObjects/fvModelFunctionObject/fvModelFunctionObject.H
index 176555ba19..18488f55eb 100644
--- a/src/finiteVolume/functionObjects/fvModelFunctionObject/fvModelFunctionObject.H
+++ b/src/finiteVolume/functionObjects/fvModelFunctionObject/fvModelFunctionObject.H
@@ -124,6 +124,9 @@ public:
         //- Do nothing
         virtual bool write();
 
+        //- Return the maximum time-step for stable operation
+        virtual scalar maxDeltaT() const;
+
 
     // Member Operators