• Standard Initialization is the recommended initialization method for porous media simulations. The default Hybrid Initialization method does not account for the porous media properties, and depending on boundary conditions, may produce an unrealistic initial velocity field. For porous media simulations, the Hybrid Initialization method can only be used if the Maintain Constant Velocity Magnitude option is selected in the Hybrid Initialization dialog box.
• The leakage current is the total amount of current due to the leakage of oxidizer to the fuel side (through the electrolyte) and the electric current across the electrolyte due to any short circuit. You can specify a value for the leakage current under Leakage Current Density
• ANSYS FLUENT SOFC With Unresolved Electrolyte Model
• Superficial velocity (or superficial flow velocity), in engineering of multiphase flows and flows in porous media, is a hypothetical (artificial) flow velocity calculated as if the given phase or fluid were the only one flowing or present in a given cross sectional area. Other phases, particles, the skeleton of the porous medium, etc. present in the channel are disregarded.

Superficial velocity is used in many engineering equations because it is the value which is usually readily known and unambiguous, whereas real velocity is often variable from place to place. Superficial velocity can be expressed as:

us=Q/A

where:
us - superficial velocity of a given phase, m/s
Q - volume flow rate of the phase, m3/s
A - cross sectional area, m2

• If a pointer in the storage array of pointers still has the value NULL, memory for the corresponding field variable has not been allocated yet. A call to the function Alloc_Storage_Vars(domain, SV_..., ..., SV_NULL); can be used to change that allocation. The expression if (NULLP(THREAD_STORAGE(t, SV_...))) can be used to test whether the memory for a particular field variable has already been allocated on a given Thread or not.
• The net transport of energy at inlets consists of both the convection and diffusion components. The convection component is fixed by the inlet temperature specified by you. The diffusion component, however, depends on the gradient of the computed temperature field. Thus the diffusion component (and therefore the net inlet transport) is not specified a priori.
In some cases, you may want to specify the net inlet transport of energy rather than the inlet temperature. If you are using the pressure-based solver, you can do this by disabling inlet energy diffusion. By default, ANSYS Fluent includes the diffusion flux of energy at inlets. To turn off inlet diffusion, use the define/models/energy? text command and respond no when asked to Include diffusion at inlets? Inlet diffusion cannot be turned off if you are using the density-based solver.