0000000000000000 V vtable for Foam::DimensionedField<double, Foam::volMesh> 0000000000000000 V vtable for Foam::fvMatrix<Foam::Vector<double> > 0000000000000000 V vtable for Foam::fvMatrix<double> 0000000000000000 V vtable for Foam::LduMatrix<Foam::Vector<double>, double, double>::solver 0000000000000000 V vtable for Foam::LduMatrix<double, double, double>::solver 0000000000000000 V vtable for Foam::Residuals<Foam::Vector<double> > 0000000000000000 V vtable for Foam::Residuals<double> 0000000000000010 W non-virtual thunk to Foam::fvMesh::thisDb() const U operator delete[](void*) U operator delete(void*) U operator new[](unsigned long) U operator new(unsigned long)
/** * @file main.cpp * @brief This is a simple C++ program demonstrating Doxygen documentation. */
#include<iostream>
/** * @brief The base class with a static variable and function. */ classBase { public: staticint staticVar; /**< A static variable. */
/** * @brief A static function to get the static variable. * @return The static variable. */ staticintgetStaticVar(){ return staticVar; }
/** * @brief A virtual function that prints a message. */ virtualvoidprintMessage(){ std::cout << "Base class message." << std::endl; }
/** * @brief The base class constructor. */ Base() { std::cout << "Base class constructor." << std::endl; }
/** * @brief The base class destructor. */ virtual ~Base() { std::cout << "Base class destructor." << std::endl; } };
int Base::staticVar = 10; // Initialize static variable
/** * @brief The derived class that inherits from Base. */ classDerived : public Base { public: /** * @brief A function that prints a different message. */ voidprintMessage()override{ std::cout << "Derived class message." << std::endl; }
/** * @brief The derived class constructor. */ Derived() { std::cout << "Derived class constructor." << std::endl; }
/** * @brief The derived class destructor. */ ~Derived() override { std::cout << "Derived class destructor." << std::endl; } };
Operating Pressure[Pa] +Gauge Pressure(Relative Pressure, Static Pressure) \(P_{absolute} = P_{operating}+P_{gauge}\) The gauge pressure is what we enter in the Boundary conditions panels. Set the gauge pressure is used to avoid problems with round-off errors which occur when the dynamic pressure differences in a fluid are small compared to the absolute pressure level
Reference pressure location, is where the absolute static pressure is known
*In fluent, if we specify pref=1atm, then if we entering a guage perssure of 0 atm at outlet then we can directly enter the value 0. even if I am giving the perssure boundary condition p=0 at outlet, there wont be any wrong in specifying the pref value = 0 in tne fvSolution file, right?*
Right, since you're solving for incompressible flows. As long as you do not over-specify the boundary (setting p and U at the same side, for example), it will be fine. The only difference could be a translation of the values of p.
这个算例里面有句话值得注意：over-specify！(setting p and U at the same side)
ASK GPT:
In OpenFOAM, when setting up a boundary condition with a constant mass flow rate velocity, you usually need to also specify an appropriate pressure boundary condition to ensure the problem is well-posed and physically accurate. The choice of pressure boundary condition depends on the specific problem and flow conditions. Here are a few options you can consider:
Inlet/Outlet Pressure: You can use the inletOutlet boundary condition for pressure at the inlet or outlet. This condition allows the pressure to be determined based on the velocity field and the specified mass flow rate, ensuring that the flow is consistent with the desired mass flow rate.
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inletOutlet { type inletOutlet; inletValue uniform(000); // Specify the velocity components value $internalField; // To set pressure equal to internalField }
Fixed Value or Fixed Gradient: Depending on the flow problem, you might be able to set a fixed value or fixed gradient for the pressure at the boundary. However, ensure that the boundary conditions do not lead to unphysical results.
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fixedValue { type fixedValue; value $internalField; // Specify the desired pressure value }
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fixedGradient { type fixedGradient; gradient uniform(000); // Specify a gradient if needed }
Zero Gradient: For some cases, you might use a zero gradient condition for pressure at the boundary. This assumes that the pressure gradient is zero, which might be suitable if the boundary is far from the region of interest or if you have a long enough domain.
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zeroGradient { type zeroGradient; }
Pressure Inlet: If you have a known pressure value at the inlet, you can directly specify that value. However, this might affect the mass flow rate, so ensure consistency with your velocity boundary condition.
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pressureInlet { type pressureInlet; p uniform 101325; // Specify the pressure value U uniform(000); // Specify the velocity components }
Remember to select a pressure boundary condition that is consistent with your desired mass flow rate velocity condition and that reflects the physics of your problem. Always validate your choice through simulations and comparisons with experimental or analytical results if available.
