Description
Return a scalar upwind interface value and flux.
A simulation update combines supplied states, fluxes, forces and time conventions. Local integration and interface terms can be evaluated independently, while a full solver must also supply consistent fields, boundary conditions, conservation and convergence behavior.
Return a scalar upwind interface value and flux.
When to use this tool
Use Upwind Advection One Interface Term when checking one explicitly supplied integration, flux or lattice-population contribution.
How to use the tool and how it works
- Enter velocity, leftValue, rightValue. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read upwindValue, flux. Use the output convention below.
Return a scalar upwind interface value and flux. Choose leftValue when velocity >= 0, otherwise rightValue; flux = velocity*upwindValue.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| velocity | Velocity | Required. Finite number. |
| leftValue | Left Value | Required. Finite number. |
| rightValue | Right Value | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| upwindValue | Upwind Value | Required. Finite number. |
| flux | Flux | Required. Finite number. |
{
"input": {
"velocity": 2,
"leftValue": 3,
"rightValue": 5
},
"output": {
"upwindValue": 3,
"flux": 6
}
}Limitations and assumptions
- Zero velocity selects the left value but gives zero flux; no reconstruction, boundary condition or full transport solve occurs.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use and validate the complete numerical method with its state initialization, boundary conditions and physical model for a reliable simulation.
References
Similar or alternative tools
- Riemann Flux Supplied Wave Speed Factor
Return a local Lax-Friedrichs/Rusanov-style numerical flux.
- Pressure Projection One Gradient Term
Return one pressure-gradient velocity correction.