From 7545ac279cb47dde4cdf9be5c94445cd506c6f34 Mon Sep 17 00:00:00 2001 From: marcvivesmassana Date: Mon, 19 Jan 2026 19:01:59 +0100 Subject: [PATCH 1/2] update --- .../04.output/02.outputs-list/00.output-fields.md | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/docs/02.simulation-setup/04.output/02.outputs-list/00.output-fields.md b/docs/02.simulation-setup/04.output/02.outputs-list/00.output-fields.md index d33d0b3..b587982 100644 --- a/docs/02.simulation-setup/04.output/02.outputs-list/00.output-fields.md +++ b/docs/02.simulation-setup/04.output/02.outputs-list/00.output-fields.md @@ -89,6 +89,14 @@ Q-criterion is used to identify vortical structures in the flow field. It repres Q_default = RefMach² / (all wall's bounding box length)² ``` +### **VelocityRelative** + +In a rotational domain, the absolute velocity, $\overrightarrow{\boldsymbol{U}}_\text{absolute}$, of each fluid element could be treated as the summation of a relative velocity, $\overrightarrow{\boldsymbol{U}}_\text{relative}$, and a velocity due to the rotating frame, $\overrightarrow{\Omega}\times \overrightarrow{r}$. The "VelocityRelative" means the $\overrightarrow{\boldsymbol{U}}_\text{relative}$: + +$$\overrightarrow{\boldsymbol{U}}_\text{absolute} = \overrightarrow{\boldsymbol{U}}_\text{relative} + \overrightarrow{\Omega}\times \overrightarrow{r}$$ + +It should be noted that the above relative velocity is zero on any no-slip walls within rotational blocks. + ## **Visualization Tips** ### Boundary Layer Separation From ce8d4fd434ac9633f8186708a880b81d6c542230 Mon Sep 17 00:00:00 2001 From: marcvivesmassana Date: Tue, 20 Jan 2026 10:36:14 +0100 Subject: [PATCH 2/2] comments --- .../04.output/02.outputs-list/00.output-fields.md | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/docs/02.simulation-setup/04.output/02.outputs-list/00.output-fields.md b/docs/02.simulation-setup/04.output/02.outputs-list/00.output-fields.md index b587982..620e857 100644 --- a/docs/02.simulation-setup/04.output/02.outputs-list/00.output-fields.md +++ b/docs/02.simulation-setup/04.output/02.outputs-list/00.output-fields.md @@ -91,11 +91,11 @@ Q-criterion is used to identify vortical structures in the flow field. It repres ### **VelocityRelative** -In a rotational domain, the absolute velocity, $\overrightarrow{\boldsymbol{U}}_\text{absolute}$, of each fluid element could be treated as the summation of a relative velocity, $\overrightarrow{\boldsymbol{U}}_\text{relative}$, and a velocity due to the rotating frame, $\overrightarrow{\Omega}\times \overrightarrow{r}$. The "VelocityRelative" means the $\overrightarrow{\boldsymbol{U}}_\text{relative}$: +This is the relative velocity with respect to the volume zone reference frame. In a rotational domain, the absolute velocity, $\overrightarrow{\boldsymbol{U}}_\text{absolute}$, of each fluid element could be treated as the summation of a relative velocity, $\overrightarrow{\boldsymbol{U}}_\text{relative}$, and a velocity due to the rotating frame, $\overrightarrow{\Omega}\times \overrightarrow{r}$. The "VelocityRelative" means the $\overrightarrow{\boldsymbol{U}}_\text{relative}$: $$\overrightarrow{\boldsymbol{U}}_\text{absolute} = \overrightarrow{\boldsymbol{U}}_\text{relative} + \overrightarrow{\Omega}\times \overrightarrow{r}$$ -It should be noted that the above relative velocity is zero on any no-slip walls within rotational blocks. +It should be noted that the above relative velocity is zero on any no-slip walls within rotational blocks. When a wall function is used, this velocity is near zero. ## **Visualization Tips**