Separate the md file into two, which correspond to each benchmark, respectively.

web/content/docs/benchmarks/two-phase-flow-PP/TwoPhaseFlowPP.md

-+++
-project = "Parabolic/TwoPhaseFlowPP"
-author = "Yonghui Huang"
-date = "2018-06-20T14:37:58+01:00"
-title = "Isothermal two-phase flow transport model with PP formulation"
-weight = 101
-
-[menu]
-  [menu.benchmarks]
-    parent = "two-phase-flow-PP-formulation"
-
-+++
-
-{{< data-link >}}
-
-## Problem description
-
-Two benchmarks are presented here which are dedicated to simulating the two-phase flow transport in porous media with the pessure-capillary pressure as the primary variables. For the detailed benchmark settings and results description, please refer to the attached document.
-
-## Results and evaluation
-
-See [this PDF](../main.pdf).

web/content/docs/benchmarks/two-phase-flow-pp-form/two-phase-flow-pp-liakopoulos.md

++++
+project = "Parabolic/TwoPhaseFlowPP/Liakopoulos/TwoPhase_Lia_quad_short.prj"
+author = "Yonghui Huang"
+date = "2018-06-20T14:37:58+01:00"
+title = "Liakopoulos experiment"
+weight = 101
+
+[menu]
+  [menu.benchmarks]
+    parent = "two-phase-flow-pp"
+
++++
+
+{{< data-link >}}
+
+## Problem description
+
+One benchmark -- Liakopoulos experiment is presented here. The benchmark is applied to simulate the two-phase flow transport in porous media with gravity effects. The pessure and capillary pressure are selected as the primary variables in this formulation. For the detailed benchmark settings and results description, please refer to the attached document.
+
+## Results and evaluation
+
+See [this PDF](../main.pdf).

web/content/docs/benchmarks/two-phase-flow-pp-form/two-phase-flow-pp-mcwhorter.md

++++
+project = "Parabolic/TwoPhaseFlowPP/McWhorter/TwoPhase_mcwt_line.prj"
+author = "Yonghui Huang"
+date = "2018-06-20T14:37:58+01:00"
+title = "McWhorter problem"
+weight = 101
+
+[menu]
+  [menu.benchmarks]
+    parent = "two-phase-flow-pp"
+
++++
+
+{{< data-link >}}
+
+## Problem description
+
+One benchmark -- McWhorter problem is presented here which is dedicated to simulating the two-phase flow transport in porous media with the pessure-capillary pressure as the primary variables. A special focus of this benchmark is placed on the capillary effects in immiscible two-phase flow transport. For the detailed benchmark settings and results description, please refer to the attached document.
+
+## Results and evaluation
+
+See [this PDF](../main.pdf).