Random Ray Linear Source Gradient Limiter - #4121

Merged

paulromano merged 27 commits into

openmc-dev:developfrom

jtramm:ls_gradient_limiter

Sep 11, 2026

Commits on Sep 3, 2026

Limit linear source gradients to keep the modeled source non-negative

John Tramm
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claude
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f175a36

Commits on Sep 4, 2026

State the limiter bound's scope precisely

John Tramm
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f872c5e
State the corner excess as a factor, not a distance

John Tramm
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a23c0b4
Describe the stability test by this PR's feature

John Tramm
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9cefdcb

Commits on Sep 5, 2026

Make the source gradient limiter a user setting that is off by default

John Tramm
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9a42adc
State the deep-penetration tradeoff without overclaiming

John Tramm
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d779c4b
Drop the box-corner factor and qualify the limiter bound honestly

John Tramm
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fc59d97
Document source_shape and source_gradient_limiter in the settings XML reference

John Tramm
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421e4a1

Commits on Sep 9, 2026

Merge branch 'develop' into ls_gradient_limiter
John Tramm
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a04d0c9
Move the gradient warmup constant to the random ray header

John Tramm
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7408cb4
Simplify the limiter's negative-source handling

John Tramm
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e79ae6f
Relate the limiter bound to MPACT's limited linear source approximation

John Tramm
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57a9702
State the limiter's shape assumption plainly

John Tramm
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59bd64e
Leave the gradient warmup count as develop has it

John Tramm
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12a95d8
Describe the limiter's bound as the slab extent it is

John Tramm
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af32254
Bound the limited source over the region's sampled bounding box

John Tramm
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d5ec13a
Store the sampled bounding box only when it grows

John Tramm
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f02d186
Describe the bounding-box bound in the limiter documentation

John Tramm
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7be7fc7
Name the box offsets correctly in the limiter comment

John Tramm
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ee58e99
Bound the minimum of the linear term, not its maximum

John Tramm
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9e3b702
Document the limiter bound as the box minimum

John Tramm
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1b96d40
Reset the sampled boxes with the centroids and report the limiter

John Tramm
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cd9703f
State the limiter bound's tightness and containment precisely

John Tramm
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cb68d2b

Commits on Sep 10, 2026

Merge branch 'develop' into ls_gradient_limiter

John Tramm
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claude
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c819ab9

Commits on Sep 11, 2026

Store each region's sampled extent as a BoundingBox

John Tramm
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a44a51a
Merge branch 'develop' into ls_gradient_limiter

John Tramm
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711bfd6
Implement BoundingBox::expand and utilize
paulromano
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e7663ee