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Ionization boundary ready to testing.

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Fixed an issue in which some particles in the corner were interacting
with the axis boundary. Now the axis acts as a reflective boundary in
case a particle is wrongly assigned to it.
This commit is contained in:
Jorge Gonzalez 2021-03-23 16:43:11 +01:00
commit 12e61731df
3 changed files with 36 additions and 17 deletions
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29
src/modules/mesh/moduleMeshBoundary.f90
View file

@ -111,6 +111,7 @@ MODULE moduleMeshBoundary
USE moduleSpecies
USE moduleMesh
USE moduleRefParam
USE moduleRandom
IMPLICIT NONE
CLASS(meshEdge), INTENT(inout):: edge
@ -118,6 +119,7 @@ MODULE moduleMeshBoundary
REAL(8):: vRel, eRel, mRel !relative velocity, energy and mass
REAL(8):: ionizationRate
INTEGER:: ionizationPair, p
REAL(8):: v0(1:3) !random velocity of neutral
TYPE(particle), POINTER:: newElectron
TYPE(particle), POINTER:: newIon
@ -128,21 +130,26 @@ MODULE moduleMeshBoundary
eRel = mRel*vRel**2*5.D-1
IF (eRel > bound%eThreshold) THEN
!TODO: Check units
ionizationRate = bound%n0*bound%crossSection%get(eRel)
ionizationRate = part%weight*bound%n0*bound%crossSection%get(eRel)*vRel
ionizationPair = INT(ionizationRate*tauMin*ti_ref/species(bound%sp)%obj%weight)
!Rounds the number of particles up
ionizationPair = NINT(ionizationRate*bound%effectiveTime/species(bound%sp)%obj%weight)
!Create the new pair of particles
DO p = 1, ionizationPair
ALLOCATE(newElectron)
ALLOCATE(newIon)
!Assign random velocity to the neutral
v0(1) = bound%v0(1) + bound%vTh*randomMaxwellian()
v0(2) = bound%v0(2) + bound%vTh*randomMaxwellian()
v0(3) = bound%v0(3) + bound%vTh*randomMaxwellian()
newElectron%sp = part%sp
newIon%sp = bound%sp
newElectron%v = 10.D0*bound%v0 + (1.D0 + bound%deltaV/NORM2(bound%v0))
newIon%v = bound%v0
newElectron%v = v0 + (1.D0 + bound%deltaV*v0/NORM2(v0))
newIon%v = v0
newElectron%r = edge%randPos()
newIon%r = newElectron%r
@ -174,16 +181,18 @@ MODULE moduleMeshBoundary
END DO
!Removes ionizing electron
part%n_in = .FALSE.
END IF
END SELECT
!Removes ionizing electron regardless the number of pair created
part%n_in = .FALSE.
END SUBROUTINE ionization
!Symmetry axis. Dummy function
!Symmetry axis. Reflects particles.
!Although this function should never be called, it is set as a reflective boundary
!to properly deal with possible particles reaching a corner and selecting this boundary.
SUBROUTINE symmetryAxis(edge, part)
USE moduleSpecies
IMPLICIT NONE
@ -191,6 +200,8 @@ MODULE moduleMeshBoundary
CLASS(meshEdge), INTENT(inout):: edge
CLASS(particle), INTENT(inout):: part
CALL reflection(edge, part)
END SUBROUTINE symmetryAxis
!Points the boundary function to specific type

15
src/modules/moduleBoundary.f90
View file

@ -35,9 +35,10 @@ MODULE moduleBoundary
!Ionization boundary
TYPE, PUBLIC, EXTENDS(boundaryGeneric):: boundaryIonization
REAL(8):: m0, n0, v0(1:3), T0 !Properties of background neutrals.
REAL(8):: m0, n0, v0(1:3), vTh !Properties of background neutrals.
INTEGER:: sp !Ion species
TYPE(table1D):: crossSection
REAL(8):: effectiveTime
REAL(8):: eThreshold
REAL(8):: deltaV
@ -99,7 +100,7 @@ MODULE moduleBoundary
END SUBROUTINE initWallTemperature
SUBROUTINE initIonization(boundary, m0, n0, v0, T0, speciesID, crossSection, eThreshold)
SUBROUTINE initIonization(boundary, me, m0, n0, v0, T0, speciesID, effTime, crossSection, eThreshold)
USE moduleRefParam
USE moduleSpecies
USE moduleCaseParam
@ -107,8 +108,10 @@ MODULE moduleBoundary
IMPLICIT NONE
CLASS(boundaryGeneric), ALLOCATABLE, INTENT(out):: boundary
REAL(8), INTENT(in):: m0, n0, v0(1:3), T0
REAL(8), INTENT(in):: me !Electron mass
REAL(8), INTENT(in):: m0, n0, v0(1:3), T0 !Neutral properties
INTEGER:: speciesID
REAL(8):: effTime
CHARACTER(:), ALLOCATABLE, INTENT(in):: crossSection
REAL(8), INTENT(in):: eThreshold
@ -117,13 +120,15 @@ MODULE moduleBoundary
SELECT TYPE(boundary)
TYPE IS(boundaryIonization)
boundary%m0 = m0 / m_ref
boundary%n0 = n0
boundary%n0 = n0 * Vol_ref
boundary%v0 = v0 / v_ref
boundary%T0 = T0 / T_ref
boundary%vTh = DSQRT(kb*T0/m0)/v_ref
boundary%sp = speciesID
boundary%effectiveTime = effTime / ti_ref
CALL boundary%crossSection%init(crossSection)
CALL boundary%crossSection%convert(eV2J/(m_ref*v_ref**2), 1.D0/L_ref**2)
boundary%eThreshold = eThreshold*eV2J/(m_ref*v_ref**2)
boundary%deltaV = DSQRT(boundary%eThreshold/me)
END SELECT

9
src/modules/moduleInput.f90
View file

@ -600,9 +600,9 @@ MODULE moduleInput
CHARACTER(:), ALLOCATABLE:: object, bType
REAL(8):: Tw, cw !Wall temperature and specific heat
!Neutral Properties
REAL(8):: m0, n0
REAL(8):: m0, n0, T0
REAL(8), DIMENSION(:), ALLOCATABLE:: v0
REAL(8):: T0
REAL(8):: effTime
REAL(8):: eThreshold !Energy threshold
INTEGER:: speciesID
CHARACTER(:), ALLOCATABLE:: speciesName, crossSection
@ -647,12 +647,15 @@ MODULE moduleInput
IF (.NOT. found) CALL criticalError("missing parameter 'velocity' for neutrals in ionization", 'readBoundary')
CALL config%get(object // '.neutral.temperature', T0, found)
IF (.NOT. found) CALL criticalError("missing parameter 'temperature' for neutrals in ionization", 'readBoundary')
CALL config%get(object // '.effectiveTime', effTime, found)
IF (.NOT. found) CALL criticalError("missing parameter 'effectiveTime' for neutrals in ionization", 'readBoundary')
CALL config%get(object // '.energyThreshold', eThreshold, found)
IF (.NOT. found) CALL criticalError("missing parameter 'eThreshold' in ionization", 'readBoundary')
CALL config%get(object // '.crossSection', crossSection, found)
IF (.NOT. found) CALL criticalError("missing parameter 'crossSection' for neutrals in ionization", 'readBoundary')
CALL initIonization(boundary(i)%bTypes(s)%obj, m0, n0, v0, T0, speciesID, crossSection, eThreshold)
CALL initIonization(boundary(i)%bTypes(s)%obj, species(s)%obj%m, m0, n0, v0, T0, &
speciesID, effTime, crossSection, eThreshold)
CASE('wallTemperature')
CALL config%get(object // '.temperature', Tw, found)