armi.materials.tests.test_fluids module

Unit tests for fluid-specific behaviors.

The ARMI framework has a lot of thermal expansion machinery that applies to all components but doesn’t make sense for fluids. The tests here help show fluid materials still play nice with the rest of the framework.

class armi.materials.tests.test_fluids.TestFluids(methodName='runTest')

Bases: TestCase

Create an instance of the class that will use the named test method when executed. Raises a ValueError if the instance does not have a method with the specified name.

class MyFluid

Bases: Fluid

Stand-in fluid that doesn’t provide lots of functionality.

density(Tk=None, Tc=None)

Return the density at the specified temperature for 3D expansion (in g/cm^3).

Notes

For fluids, there is no such thing as 2D expansion so pseudoDensity() is already 3D.

class MySolid

Bases: Material

Stand-in solid that doesn’t provide lots of functionality.

density(Tk: float = None, Tc: float = None) → float

Return density that preserves mass when thermally expanded in 3D (in g/cm^3).

Notes

Since refDens is specified at the material-dep reference case, we don’t need to specify the reference temperature. It is already consistent with linearExpansion Percent. - p*(dp/p(T) + 1) =p*( p + dp(T) )/p = p + dp(T) = p(T) - dp/p = (1-(1 + dL/L)**3)/(1 + dL/L)**3

test_fluidDensityWrapperNoWarning()

Test that Component.material.density does not raise a warning for fluids.

The ARMI Framework contains a mechanism to warn users if they ask for the density of a material attached to a component. But the component is the source of truth for volume and composition. And can be thermally expanded during operation. Much of the framework operates on Component.density and other Component methods for mass accounting. However, comp.material.density does not know about the new composition or volumes and can diverge from component.density.

Additionally, the framework does not do any thermal expansion on fluids. So the above calls to component.material.density are warranted for fluids.